1/4″ hex shank countersinks are fine for a quick drill. They don't slip in drill chucks. You can make deep countersinks easily by setting the countersink's depth stop to allow the countersink to drill more deeply into the worksurface.
eBay
STONEGO Masonry Drill Bit, 6/8/10/12mm Concrete Tile Glass Wood Drill Bit Tungsten Carbide Tips, for Wall, Metal, Ceramic, Brick
Aliexpress UK
Shank type: round. 6x Drill Bit.
eBay
5/10Pcs 1-14mm Twist Drill Bits HSS High Speed Steel Drill Bit Set Straight Round Shank for Hard Metal,Stainless Steel,Cast Iron
Aliexpress UK
1/4″ hex shank countersinks are fine for a quick drill. They don't slip in drill chucks. You can make deep countersinks easily by setting the countersink's depth stop to allow the countersink to drill more deeply into the worksurface.
eBay
Drill Bit Multi-function Triangle Drill for Ceramic Tile, Concrete, Wall, Metal Wood Drilling Hole Cutter Glass Drill Bit
Aliexpress UK
3Pcs HSS Countersink Countersunk Deburring Drills Tapered For Carbon Steel Wood.
eBay
4 -32mm HSS titanium coated metal hex core drill bits High Speed Steel step drill bit set cone hole Wood cutter Taper metric
Aliexpress UK
Fisch 5mm - 10mm (1/4-Inch - 3/8-Inch) Deburring Countersink is suitable for use in metals and all types of wood for countersinking and deburring of bores. It works chatter and bur free creating a high quality surface. It can be reharpened with a grindstone at the breast in the hole. Made from cobalt high speed steel.
eBay
Tungsten Steel Drill Bit, Super Hard Alloy Tungsten Steel Drill Bit, Specially Designed for Drilling Stainless Steel Plates, Electric Drills, Drilling Holes in Steel Plates, Steel Pipes, and Metal
Aliexpress UK
Carpentry Countersink Drill Bit Set. - Five Flute Chamfer Debur Countersink. - Contains all popular sizes of countersink bits. 1 x Hex shank countersink drill 12mm. 1 x Hex shank countersink drill 16mm.
eBay
Drill Bit Metal Drills Woodworking Job Tools Set Tool Mechanical Bits Wood Multifunctional Accessories Garden Mini Sets Hand Saw
Aliexpress UK
1/4″ hex shank countersinks are fine for a quick drill. They don't slip in drill chucks. You can make deep countersinks easily by setting the countersink's depth stop to allow the countersink to drill more deeply into the worksurface.
eBay
10pcs Tungsten Alloy Router Bit Set | Single Flute Rotary Bits for Grinding Polishing Carving, Metal Wood Stone Tool Durable
Aliexpress UK
Drill and countersink for wood screws without changing bits. 4 x Countersink D rillBits. Black chamfer drill body material: steel 45. Material: HSS Drill 4241. Shank: 1/4 hex shank. 1 x Hex Shank. Special designed steel counter sleeve countersinks or counter bores pilot hole.
eBay
Chamfering cutter Countersink Bar Indexable Chamfer Milling Cutter Tool Holder 30 45 60 Degree TC AP C20-20 C16-16 Spot Drilling
Aliexpress UK