Ideal set for power screwdriver or variable speed drills. Bits are always at hand in easy-to-carry, compact plastic case. Extra-hard bits stand up under constant, heavy-duty use. Bits are 1" long with 1/4" hex shank. General purpose set (P/N 15692) includes 17 pieces (#1, #2 and #3 Phillips bits; 3-4, 6-8, 8-10 and 10-12 slotted bits; Nos. 1 and 2 square recess bits; 5/32" and 3/16" clutch bits; TX10, TX15, TX20, TX25 and TX30 torx bits; and 2-1/8" bit extension. Master screwdriving set (P/N 15693) includes 33 pieces (#1, #2 and #3 Phillips bits; 3-4, 6-8, 8-10 and 10-12 slotted bits; Nos. 0, 1, 2 and 3 square recess bits; 1/8", 5/32", 3/16" and 1/4" clutch bits; TX8, TX9, TX10, TX15, TX20, TX25, TX27, TX30 and TX40 torx bits; 5/64", 3/32", 7/64", 1/8", 9/64", 5/32" and 3/16" Allen bits, and 2-1/8" bit extension.