Riser Clamp, Pipe Size 2 1/2 In, Max Load 400 Lb, Material of Construction Carbon Steel, Length 11 1/4 In, Bolt Size 7/16 In, For Support Of Stationary Steel Pipe Risers, Cast Iron Pipe Or Conduit. 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). UL, ULC Listed. Package of 10.