Cobalt Countersink Drill Bits Set(5PCS), M35 HSSCO 82 Degree 5 Flutes,1/4 Inch Quick Change Hex Shank for Stainless Steel, Metal, Wood, Carbon Steel 1/4” 3/8” 1/2” 5/8” 3/4”

9 reviews for Cobalt Countersink Drill Bits Set(5PCS), M35 HSSCO 82 Degree 5 Flutes,1/4 Inch Quick Change Hex Shank for Stainless Steel, Metal, Wood, Carbon Steel 1/4” 3/8” 1/2” 5/8” 3/4”

1. 

   D. D. McClelland – November 18, 2025

   VALYRIANTOOL Cobalt Countersink Drill Bits
   If you are into DIY, or Modelmaking, these are useful tools and well priced.

2. 

   Billy – November 18, 2025

   Good Quality M35 Countersink Bits
   These countersink drill bits come as a 5-piece M35 cobalt HSS set in 1/4″ to 3/4″ head sizes each with a 1/4″ quick change hex shank. They come sharp and are well-machined. I have used them exclusively in hardwoods and they have performed well with nice clean countersunk holes. I have not noticed any change in their cutting action, and they should last a substantial length of time. They do come only in a thin open plastic holder that is fine for inside a drawer but does not suffice for a storage case for transport or for leaving out open in the shop. I personally relocated them to a custom 1/4″ hex shank holder I made for them for storage in my drill cabinet, so they remain protected and ready for use. I am quite happy with their performance and quality and would recommend them.

3. 

   M. Tin – November 18, 2025

   Ok for the price
   These are not top of the line bits, but they will get the job done. I drilled 24- 5/16 holes and used the 1″ counter sink for all of them and it worked fine.

4. 

   D – November 18, 2025

   Nice bit set – wish they had come in a case
   I do a lot of DIY and handy work so these were a good set of bits to add to my toolbox. They have held up really well so far. They are sharp and precise. I’ve been happy with how well they work. The only complaint I have is that I wish they had come in some kind of case. Other than that, I’m very happy with these bits.

5. 

   Jason Kelly – November 18, 2025

   Garbage
   If I could give it 0 I would. Cobalt my a$$. Didn’t do anything to the piece of steel I have. A return is in the future.

6. 

   Paul H Airhart – November 18, 2025

   Worked good not great on steel
   It said it was for metal also, but even with the work in a vice and the counter sink chucked up in a drill press it chattered.I was going for a sharp chamfer on the holes, ended up having to use a stone to grind them smooth, sanded and polished and the sharp edge went away. Too bad. They should work great on everything else, just not a high carbon steel.

7. 

   goat8485 – November 18, 2025

   Wow these make nice countersink holes
   I use these primarily for woodworking and home repairs. Countersunk holes just look cleaner and more professional. These cut easily and cleanly and I’ve been really impressed with the holes that these cut. They work great, especially for the price. I do wish they came with a nicer case, but that’s a pretty trivial complaint. Would gladly order these again!

8. 

   T C – November 18, 2025

   Great little countersink bits.
   Handy addition to my tool set. Several common sizes, 1/4” drive so I can use my smaller drill driver tool. They work very well for countersinking wood and metal. Very sharp and so far have held an edge. A better storage case would have been nice, but they still meet their intended use. Good value.

9. 

   Luis – November 18, 2025

   Ya los he utilizado para avellanar aleaciones de aluminio y últimamente también he avellado láminas de acero y funcionan muy bien, buen producto.