Best countersinks I've found - keep one on my cordless tool. I am a carpenter and builder by trade. I use these bits for rough woodworking, door and window installation, floor and wall paneling, workshop fixtures, but these bits really shine when I'm building and installing cabinets. I can adjust the countersink to the length of the screw to ensure a good grip without cracking hard materials or blowing out the side of the plywood or MDF. The conical HSS center drill penetrates hard wood gently and quickly and is easy to mark thanks to the sharp tip. I also use them as pilot bits when drilling holes in critical areas like installing finishing equipment. The kit includes an adjustable countersink depth gauge and an Allen key. FTG also sells replacement bits and complete sets (#4, #6, #8, #10, #12) for both small and large screws. Best value for money from the USA!