Riser Clamp, Bolt Diameter 1/2 in, Bolt Length 1 1/2 in, Clamp Material Steel, Clamp Material Finish Copper-Plated, For Copper Tube Size 4 in, For Maximum Outside Diameter 4 1/8 in, Load Capacity 300 lb, Mounting Hole Diameter 0.438 in, Overall Height 1.25 in, Overall Length 2 in, Overall Width 1 1/4 in, For Use On Tube, Standards MSS SP-58, Type 8, WW-H-171, Type 8. This item has been restricted from sale in the following state (s): []