Big Horn 19772 T-Bolt - 5/16-18 Inch x 1 1/2 Inch Go to amazon.com Related posts The 12 best t-bolts 5/16 2022 Feature1/4-20 Inch x 1-3/4 Inch DescriptionBig Horn 19772 T-Bolt - 5/16-18 Inch x 1 1/2 Inch fit inside T-slot track or a groove routed with T-slot bit.