Riser Clamp, Bolt Diameter 3/8 in, Bolt Length 3/8 in, Clamp Material Steel, Clamp Material Finish Copper-Plated, For Copper Tube Size 3 in, Load Capacity 300 lb, Mounting Hole Diameter 0.375 in, Overall Length 11.94 in, Overall Width 1 1/4 in, For Use On Tube, Maximum Operating Temperature 450 Degrees F, Standards MSS SP-58, Type 8, Cushion Material No Cushion, Cushioned No