BUTT WELDING CLAMP. A SIMPLE AND EFFICIENT WAY OF ENSURING A CLEAN AND STRAIGHTFORWARD WELDED BUTT. HOLDING MATERIALS EDGE TO EDGE PERFECTLY PRIOR TO BUTT WELDING, ALMOST NO GAP TO ALLOW FULL PENETRATION OF THE WELD. PATENTED ADJUSTABLE SCREW TO SET THE SIDE LEVELLY DEPENDS ON THE SIDE YOU NEED. ADJUSTABLE THICKNESS CLAMP FORM 0~3MM FOR EACH SIDE. PACKING: SLIDE CARD. 4PCS/SET