4PCS Cobalt Single-End Countersink Chamfer Tool Set - Heavy-Duty M35 90-Degree Countersink Bits for Metal, Stainless Steel, Copper, Wood, Fiberboard,SAE 1/4"-3/4", 2-5, 5-10, 10-15, 15-20MM

I love this bit; working on wood, metal, and plastic. Nice clean cutting; makes project assembly look proffessional.

This is an outstanding countersink. Excellent quality and makes a perfect cut every time. Wish I had one of these years ago.

I used the smaller of the three (not sure when i will ever use the larger two, wish i could have purchased a smaller set of three for household uses) and drilled a pilot/through hole for the h/w i was going to use. Using a hand drill with adjustable collet, the chamfer tool worked perfectly. i needed to increase the screw diameter size, hence the chamfer diameter needed to increase slightly and i was able to resize w/o any difficulty. All told, the tool cuts nicely w/o chatter or wander and gave me the countersink i needed.

Great for SS

Finally used this today. Great reaming bits for the price. Cuts smooth and steady. No chatter like other 4 blade cutters. Will recommend.

I don't usually write reviews but I just had to for these bits. I don't always need the highest quality tools for my work but I had a project that required a lot of work on 316 stainless and needed some high quality taper bits. I had gone through several at that point but I gave these a shot thinking I would likely be disappointed but wow I was not. These are very hard and cut cleanly through the 316 with ease. Not only that but they lasted through the entire project. I want to buy a second set in case they go away but with how well these are lasting not sure I need to. So I thought I could do the next best thing and write a review so hopefully they can keep sales up so they continue to sell these. These are super high quality tools from Amazon so please give them a shot before you end up with the junk that wont last a single cut. This set comes in 3 sizes so it's basically a one time purchase that will last in your tool set for many years under normal use.

Work great

These work very well in soft and hard wood. They are sharp unlike other ones I've had. Nice smooth cut in wood. They do clog with wood chips but easy enough to clean out. Good purchase.