Material: HSS 4241Titanium. Package Included: 5 x Drill Bits; 1 x Allen wrench. The Most Often Used 5 Sizes For Carpenters, Cabinet, Furniture Makers And Other Wood Working Trades. Loosen Set Screw To Adjust Drill Bit Depth For Variable Screw Lengths. The Drill Bit Is Replaceable. Adjustable counter sleeve depth with allen wrench; Standard 1/4-Inch hex shank is quick change compatible.
using this product, our team found that it produced uneven holes that were not fully countersunk. The drill bit also dulled quickly, causing additional frustration when trying to achieve a clean finish on our metal workpieces....
These bits are not very good. The center drill adjusts and the set screw holds well, but the countersink is poorly designed and won't cut. I used #8 to countersink some holes in the cherry and it took a lot of effort to cut the countersink. They are terrible to use. Also, #8 had some wobble, as if the pilot drill was off-axis with the countersink. After minimal use the pilot jet broke on the 20th hole and I threw the whole set in the trash and went to the store and bought a good quality jet.
Pros
The most commonly used 5 sizes for carpenters, lockers, furniture makers and other woodworking trades.