Riser Clamp Bolt Diameter 3/8 in Bolt Length 1 1/4 in Clamp Material Steel Clamp Material Finish Copper-Plated For Copper Tube Size 1/2 in For Maximum Outside Diameter 5/8 in Load Capacity 75 lb Mounting Hole Diameter 0.438 in Overall Height 1 in Overall Length 1.25 in Overall Width 1 1/4 in For Use On Tube Standards MSS SP-58 Type 8 WW-H-171 Type 8