Milwaukee, 3 Piece, Countersink Bit Set features #6, #8 and #10 Countersinks. The bits pre-drill and countersink. The 1/4" Quick Change Hex Shanks allow for quick size changes. The drill bit length is adjustable to allow for precise depth control. Includes #6 countersink with 9/64 In. bit, #8 countersink with 11/64 In. bit, #10 countersink with 3/16 In. bit.