6-Piece Serrated Drill Bit Set — Cobalt Tips That Open Any Hole
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Six Serrated Drill Bits That Turn a Rough Hole Into a Clean One
Cobalt-grade tips that bite on contact, cut sideways, and reach sizes your round bits cannot.
You drill a hole. It is the right position but the wrong size, and now you need it a little wider.
A standard bit will not open a hole sideways, so you reach for a file, or you step up through three more bits, or you start the whole thing again an inch over. Plywood splinters on the exit. The bit wanders off your pencil mark before it bites. And the cheap set you bought last year has two bent bits and one that has gone dull enough to burn the wood instead of cutting it. That is the part nobody warns you about: it is rarely the drilling that wastes your afternoon. It is the fixing afterwards.
Why These Bits Cut Instead of Skid
Most inexpensive sets are made from standard high-speed steel with a plain ground point. The edge is sharp on day one and soft on day thirty, and the tip tends to slide across the surface until it finds a groove of its own choosing.
This six-piece set works differently in three specific ways.
The point is split. A 135° split point creates two cutting edges that meet at the centre, so the bit starts cutting the moment it touches the surface. That is what stops the walking you get from a standard tip, and it means you do not have to punch a starter dent first.
The flutes are serrated. Instead of a smooth spiral, the cutting edges carry fine teeth down the length of the flute. Those teeth let the bit enlarge a hole sideways rather than only straight down, and they break the waste material into small chips that clear out of the way instead of packing the flutes.
The surface is titanium coated. The gold coating holds the cutting edge a little longer and gives the chips somewhere slick to slide off, which keeps friction and heat down on longer runs.
Three Reasons This Set Earns Its Space in the Box
1It fixes the hole you already made.
This is the whole point of a serrated bit. You bore your pilot hole, discover the fitting needs an extra millimetre, and instead of starting over you run the next size through the same hole and open it up on the spot. The six sizes step from roughly 3mm to 10mm, so you can work upward in small increments and stop exactly where the part fits.
2One box covers wood, metal and plastic.
The cobalt-grade steel and the split point are built for more than pine. These bits will take on hardwood, sheet metal, stainless steel, plastic and light masonry work, which means fewer trips back to the shelf to hunt for a second set. For anyone doing repairs and small builds around the house, that range is the difference between a finished job and a job that waits until the right bit arrives.
3The kit is honest about weight.
These bits have real heft in the hand, and that weight is doing work for you. A heavier bit with a round 6mm shank sits steadier in the chuck, transfers your pressure straight into the cut, and gives you more control when you are working at an awkward angle or pushing sideways to open a hole. It reads as confidence instead of flex, and it makes a genuinely tedious task feel like something you can steer.
Who This Set Is Built For
It suits anyone who repairs and builds rather than drills once a year. If you fit door hardware, hang shelving, work on a boat or trailer, patch furniture, mount brackets into masonry, or keep a workshop where something always needs a hole made bigger, this set belongs within arm's reach.
It also suits the person who has a drawer full of blunt and bent bits and keeps meaning to replace them properly. One organised set with a clear size range beats eight loose bits of unknown origin.
Serrated vs Standard Drill Bits
| What Matters | This Six-Piece Set | Typical Round Bit Set |
|---|---|---|
| Starting the hole | 135° split point bites on contact — no starter punch needed | Plain point slides until it finds grip |
| Enlarging a hole | Serrated flutes cut sideways to open an existing hole | Cannot open a hole sideways — start over or file by hand |
| Heat and friction | Titanium coating keeps the edge running cooler | Bare steel dulls and burns the workpiece |
| Materials | Wood, metal, stainless steel, plastic, light masonry | Usually fine on softwood only |
| Shank fit | Round 6mm shank seats firmly in a standard chuck | Variable, often slips under load |
| Storage | Six sizes in one blister pack, sorted and together | Loose bits, sizes unknown |
What People Say After Using Them
★★★★★
Used them on 18mm plywood over a weekend and they opened up holes neatly without swapping tools or reaching for a file. They bite well, clear the waste quickly, and feel far more controlled than forcing a normal bit sideways. The spread of sizes is handy because you can start small and work up until the fit is right.
Andy M.
★★★★★
Bought these because the old ones in the drawer had gone brittle and most of them had snapped. The quality on these is genuinely good and they carry a nice weight, which makes them easier to use than the thin ones.
Bukhari C.
★★★★★
Used mainly on wood and thin metal sections and got clean, even holes. The cut is precise and the bits enter the material without much fuss, especially at a sensible speed and moderate pressure. After several uses there was no obvious distortion and no real loss of sharpness.
Mary S.
The one note worth passing on: they arrive in a packet, so wipe them down before you set them on a clean surface. That is packaging, not the tools.
How to Use Them
Set the bit. Slide the round 6mm shank into a standard chuck and tighten it down firmly. The round shank seats evenly, so you should not need to fight it.
Start at the size below your target. Begin with a smaller bit to establish the hole, then step up through the sizes until the fitting passes through the way you want.
Let the teeth work. Run a moderate speed with steady, even pressure. These bits cut as they turn, so leaning on the drill harder does not speed things up — it just heats the edge.
Clear the chips. Back the bit out periodically to let the swarf out of the flutes. Clean flutes cut faster than packed ones.
Work up in small steps. Opening a hole by one size at a time keeps the cut round and controlled. Jumping several sizes at once is how holes go oval.
Drill through into scrap. Put a piece of waste timber behind the workpiece when you can. It supports the fibres on the exit side and saves you the splintered edge.
Frequently Asked Questions
What sizes are in the set?
Will these fit my drill?
Can they really cut sideways?
What materials can I use them on?
Do I need to centre-punch first?
How do I keep them cutting well?
The Hole You Already Drilled Is Not a Mistake
It just needs to be a bit bigger. That is the whole idea behind this set: six titanium-coated bits with serrated flutes and split points, sized to step up gradually so you can open an existing hole instead of abandoning it. They cut sideways, start without walking, and handle wood, metal, stainless steel and plastic from the same box.
If the bits in your drawer are bent, blunt, or unknown sizes, this replaces all of it in one go — and gives you the one capability a round bit set never had. Stock on this six-piece set moves in batches, and the current batch is in stock now.