The Heavy Duty T-Track is great for constructing jigs on workbenches, drill press tables & more. The Heavy Duty Aluminum T-Track has a 1/8" wall which will not bow or twist & allows for everday heavy use. Track has pre-drilled and countersunk holes for mounting. No more hunting for hard to find T-Bolts or special locking pieces. Works with 3/8" x16 hex head bolts which can be found at any local hardware store. Perfect for all your jig and fixture needs that require more holding power. MADE IN THE USA!