1-1/2x6 speedbor max bit. Speedbor Max is the fastest Speedbor. Tri-flute design for faster chip ejection. There are 3 cutting edges for added durability and the full screw tip allows the bit to self feed for easier pull-through. 1/4" quick change hex shank prevents slipping in drill chucks and bit extensions. Fits all standard quick change chucks and adapters. 1-1/2" x 6"