'Riser Clamp, Tube Size 4 In, Max Load 300 Lb, Material of Construction Copper Plated Steel, Length 13 In, Bolt Size 1/2 In, For Support And Steadying Of Copper Tube Risers, Either Insulated Or Non-Insulated. Not Intended For Use With Hanger Rods., Standards A-A-1192A (Type 8), WW-H-171-E (Type 8), ANSI/MSS SP-69, and MSS SP-58 (Type 8).'