Faster and easier to engage/disengage hole saw. Drives off pins, not threads. Prevents hold saw from locking on arbor, arbor threads directly into hole saws.• Sizes: 1-1/4" to 6"• Shank type: solid hex• Shank size: 1/2 & larger• 3L arbor with 3.5" pilot drill bit for hole saws• Faster and easier to engage/disengage hole saw• Drives off pins, not threads• Prevents hold saw from locking on arbor• Arbor threads directly into hole saws.• Hardened carbon steel for strength• Split point pilot drill for faster penetration and less walking