General Tools 34ST Pilot Bit Set
This set of 4 adjustable pilot bits is designed to drill precise countersink and counterbore screw holes for fine carpentry and woodworking. The 1/4" hex shanks prevent slippage and can be used in power screwdrivers, as well as electric drills. Included are bits 34A (for 5,6,7 screw sizes), 34B (for 7,8,9 screw sizes), 34C (for 9, 10, 11 screw sizes), and 34D (for 11,12,13 screw sizes).
SPECIFICATIONS

34A (for 5,6,7 screw sizes)
34B (for 7,8,9 screw sizes)
34C (for 9, 10, 11 screw sizes)
34D (for 11,12,13 screw sizes)