The Griplock™ System coupler is swaged onto the reinforcing bar’s ribs to produce a mechanical interlock. Rebars are swaged onto the coupler. Griplock™ Cold Swage System Mechanical Couplers are a fast, economic and easy way to splice deformed reinforcing bars. The Griplock™ family of cold swage mechanical couplers requires a BARUS cold swage, bench and/or portable press.