Replacement keyhole bit - 1/4" shank 3/8" diameter. For use with the CarveWright Keyhole Function. Software NOT INCLUDED, purchase HERE. One keyhole bit does come INCLUDED with the Keyhole Function purchase. Select Adapter Style: · No Adapter (for CarveTight)* · With QC Adapter (for old-style Quick Change chuck) +$10 *CarveTight Spindle - Bit will require 1/4" split collet and 1/4" stop collar. Each sold separately.