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Screw Clamps "Super Extra" with powerful Clamping with less Effort. Nodular cat Iron Jaws, New ergonomic desing. Bar attachment to the Jaw by a Rivet Free System. PATENTED Trapezoidal Tread Totally Sealed and Permanently lubrified. Handle with multiple Choices of positioning High resestance Steel Bar. Hardened Steel Brake. Braking System of Total Warranty Clamping Piston in two versions