Riser Clamp Bolt Diameter 5/16 in Bolt Length 5/16 in Clamp Material Steel Clamp Material Finish Copper-Plated For Copper Tube Size 1/2 in Load Capacity 75 lb Mounting Hole Diameter 0.313 in Overall Length 8.5 in Overall Width 1 in For Use On Tube Maximum Operating Temperature 450 Degrees F Standards MSS SP-58 Type 8 Cushion Material No Cushion Cushioned No