... Iron Beam Clamps Material:Malleable iron,Ductile iron Rod Size:1/4-3/8-1/2.. Surface:Plain,Zincing UL Certificate Malleable Iron Beam ... weight,and convenient installation.2. week capacily of 10000 pcs.3.large for cheap pric steel beam clamp1) Our span clamp ... 's used for "I" steel crystallization.3) Size: M10,M12. Inch standard , 3/8", 1/2", 5/8", 3/4"......4) Material: malleable iron,ductile iron ...