Countersink Drill Bits 6 PCS, MOHOO HSS 6542 Countersink Drill Bit Set 90 Degrees, Titanium Chamfer Cutter Drill Bits for Wood, Metal, Machine Tools 6.3/8.3/10.4/12.4/16.5/20.5mm, Positioning Drill

So far have used them in my work place on food grade stainless steel: a tough material and they are holding up to moderate use.

I needed a harder CSK bit to handle mild steel. These were much better for that than others I have used and quickly cut decent countersinks but they did chatter a little. On balance they did the job and Im well satisfied

all good, with no problems

Using these to countersink holes in loft floorboards. They remove quite a bit of wood quickly so don’t push too hard or you’ll end up creating quite a hole.With the different sizes you can select the right side bit for the job you want which makes the final result a bit more predictable than the traditional large countersink.

I should have bought a set of these years ago.I frequently countersink holes in alluminium and I've been using an old countersink that was intended for wood.For steel I used a larger steel drill to countersink, which left a ragged crater.These work perfectly, for any material, up to and including mild steel.

good quality product

No good for 304/316 stainless steel

I am an amateur wood worker and welder. These are a valuable addition to the tool box. Well made. Take note from other reviews in the limits of them. So far so good for me.