Milescraft 5341 Counter Bit Set, 4-Piece - Countersink Bits ...
I've purchased this product many times. They are not top quality but for general use they work great. The drill bits are replaceable and the depth is adjustable with the supplied allen wrench.
RAM-PRO 7-Pc Countersink Drill Bit Set with Stop Collars ...
RAM-PRO 7-Pc Countersink Drill Bit Set with Stop Collars & Wrench, Perfect for Wood | Quick Change Pre-Drill Counterbore Drill Bits Made for Screw Sizes: # 5, 6, 7, 8, 9, 10, 12.
Drill bit - Wikipedia
Drill bit geometry has several characteristics: The spiral (or rate of twist) in the drill bit controls the rate of chip removal. A fast spiral (high twist rate or "compact flute") drill bit is used in high feed rate applications under low spindle speeds, where removal of a large volume of chips is required.
The 15 Best Drill Bit Sets and Screwdriver Bits of 2018
Find the best bit for your project and be confident that the bits you plan to use will be able to drill through your workpiece without causing any damage.