These pliers combine a rocking nylon back-side jaw and a fixed rubber front-side jaw in parallel action combination to securely and easily mount all single & double bushing mount rimless lenses. The rocking nylon jaw and the parallel action insures that the bushing is set flat and tight against the lens, regardless of the lens base curve. The rubber jaw eliminates "jaw slip" and prevents marring of the frame & lens during setting. FREE SHIPPING ON ALL ORDERS OVER $35.00!