3/8" Diameter Straight Bit, 1.25" LOC, 1/2" Shank Select the appropriate style bit adapter for your machine. Select W/Bit Adapter for old-style Quick Change Chuck - Adds $10 to cost of bit Total w/bit adapter is $29.99 or Select w/No Adapter for new CarveTight Spindle Total w/out adapter is $19.99 This item will also require 1/2" Rubber Stop Collars sold separately.