This clamp stays rigid, even at a high tightening torque, and does not slacken. The robust, hardened, hollow profile bar with ribbing and corrugated malleable cast iron clamp arms are designed for clamping for up to 6000 N. A setscrew in the sliding arm, which grips into the ribbing of the bar, offers maximum security against loosening and slippage. Ball-jointed pressure plate (as of 80 mm jaw depth plates can be replaced without tools), strong trapezoid thread, beechwood handle.