Milescraft Track Master Track Lock Kit Universal T-Track Kit #4023 #4022The solid, heavy duty base helps spread clamping pressure evenly across your tabletop, reducing track tear out. The non marring base shoe prevents scratching and damage to your work table surface. TrackMaster Kit includes: 3" Bench Clamp and T Bolts 20 (7 16 x 5 8), M8 x1. 25 (13mm x 20mm), M8 x1. 25 (23mm x 30mm), M8 x1. 25 (30mm x 35mm) The TrackLock is compatible with any brand or size of bench clamp that mounts with a 5 16 18 fastener.