Irwin® Speedbor® Hex Key Extension, Heavy Duty, Manual Locking, 12 in Length, Steel, For Use With: Quick-Change Shank, Hex Shank and Round Shank
- Not for use with quick-change wood boring bits
- Follows 5/8 in and larger bits through hole
- Heavy duty, double set screw type, adds 6 - 12 in to regular bit lengths
- 1-1/16 in OAW
- Forged of finest quality tool steel
- Compatible with self-feed drill bits