A threaded pin in the sliding block engages with the rail's ribbing. This effectively prevents the clamp from loosening or slipping. Both the upper and lower parts are made from high-quality ductile cast iron and reinforced with ribs. The powder coating protects against corrosion, and the characteristic ribbed profile provides reliable reinforcement against torsional forces. The BESSEY hollow profile rail, produced in-house, is specifically optimized for clamps. The six-fold ribbing additionally prevents the clamp from slipping. The tool-free interchangeable pressure plate adds even more convenience to your daily work. It can be easily and quickly replaced.