Not for use with quick change woodboring bits
For all wood bits with 1/4" round shanks, three flats on shank. Follows 5/8" and larger bits through hole. Heavy-duty, double set screw type, adds 6 to 12" to regular bit lengths. Forged of finest quality tool steel. Allen wrench included.
Brand: Irwin Tools, Model: 88601, Color: Silver, Size: N/A