Slide 1/4″-20 hex head bolts anywhere along the slotted track for use ashangers. Bolts are sold separately. T-slotted track is also used to positionclamps and jigs on workbenches and table saws. Track is clear-anodizedaluminum. Mounting holes are on 3″ centers and require No. 8 pan head screws. Length: 48″ Height: 5/8″ Projection: 1/2″