' Beam Clamp, Standard Duty, Max. Load (Lb.) 1000, Material Carbon Steel, Width (In.) 4, Bolt Size (In.) 3/8, Beam Width 4 In., Metal Detectable Yes, Clamp Center Load On Beam To Prevent Distortion., Galvanized Finish, Standards A-A-1192A (Type 21), WW-H-171-E (Type 21), ANSI/MSS SP-69, and ANSI/MSS SP-58 (Type 21). UL Listed when used with 3/8 In. and 1/2 In. rod. '