The D260 Bar Lock? Weldable Coupler is a Type 1 (S/CA Series) or Type 2 (L Series) mechanical splice used to connect rebar to structural steel. It consists of a thick walled steel tube chamfered for welding to structural steel, specially designed lock shear bolts, stop pin and serrated grip rails. The D260 Weldable Coupler is made from USA melted and rolled steel.