Irwin Speedbor Wood-Boring Drill Bit Extension, 88702

Double set screw with Allen wrench. Recommended for all 1/4" round shank drill bits requiring extra reach. Follows 5/8" and larger bits through hole. 1/4" shank. Only fits round shank Speedbor or Do it Best brand bits. No. 88702: Length: 6", Shank Size: 1/4", Pkg Qty: 1, Package Type: Card No. 88601: Length: 12", Shank Size: 1/4", Pkg Qty: 1, Package Type: Card