The MILWAUKEE SHOCKWAVE 3PC Countersink Bit Set features #6, #8 and #10 Countersinks. The pre-drill and countersink bits are designed for use in Milwaukee Drill Drivers. The 1/4" Quick Change Hex Shanks allow for quick size changes. The 1/8" Hex drill bit length is adjustable to allow for precise depth control. The MILWAUKEE Flat Boring Bits are the ideal solution for boring holes at any angle in a variety of materials. The premium quality spade drill bit is made of heat-treated high carbon steel. The pilot drill point and cutting edge of the paddle bit are designed to be resharpened, saving time while extending the life of the bit. The 13-piece flat spade bit set bores clean, fast holes at any angle in wood, plastic, plywood and Formica.