Heavy duty clamps for welding, provide more powerful clamping force 3505 LBS (15600 N / 1590 KGS), thick rail 1-11/64" x 9/16" (29.7 x 14.3 mm) Construction of full body steel bar clamp, 5-5/8 inch (140 mm) Throat and Max jaw opening 10 inch (250 mm) Black oxide spindle resists wear and tear while impeding rust, swivel pad centers on work piece for a sturdy and stable hold, non-marring and protect the workpieces Drop forged arm provides minimal flex under heavy workloads, sliding arm clamps for welding MAXPOWER welding F style clamps, a heavy duty clamp tool used in welding processes to hold metal workpieces securely together MAXPOWER Thick F Clamp 250 x 140 mm, pack of 2