This standard duty arbor with 1/4 inch spindle & spacers enables mounting of 1/4 inch bore slotters with & without bearings in a variety of positions. OL 63.5 mm Spigot dia. 1/4 inch Spigot dia. 6.35 mm Spigot length incl thread 35.5 mm Spigot thread length 14.5 mm