The TWINTIER is the newest edition to our Rebar Tier line. This model relocates the wire spool to below the jaws of the tool, gun. By Airmatic. ADVANTAGE: the wire is then fed through the tool and looped twice, to create a twin wire tie as opposed to the 3 wrapped single wire tie in previous models. In a single wrap the TWINTIER produces a stronger, more secure rebar connection in 30% less time! A “wire rod withdrawal mechanism” pulls the wires efficiently and tightly to strengthen the binding force to increase tying force by 53%. The combination of a retraction mechanism of the tie wire, and two-wire loops make the RB441T the ideal tool for structures that require an intense binding force.