Square bolt (C bolt) 50 mm ID * 55 mm IH - T304 Stainless Steel complete with 1 full nut and 1 half nut on each leg Please refer to diagram for details (all measurements in mm): A = 4 mm B = 50 mm C = 55 mm D = 20 mm Centers = 54 mm R (inside radius) = 2 mm Material Finish T304 Stainless steel provides a corrosion and oxidation resistance, however it can tarnish. Used extensively in every day life, but if you need a higher level of corrosion resistance such as in a marine environment look for T316 Tolerance on dimensions +/- 1 mm. Please note that as we use roll threading, the bar diameter is slightly less than the thread diameter