1.5" 5/16-18 T-Bolt, 5 Pack Go to amazon.com Related posts The 12 best t-bolts 5/16 2022 Feature5/16'' - 18 bolt bottom plates are 9/16''W x 7/8''L x 7/64''HZinc-plated steelSold in packs of five DescriptionCustomize your own jigs. The T-heads fit inside T-slot track or a groove routed with T-slot bit #26099.