Malleable cast iron screw clamps are applied when rigid and inelastic clamping is required. With dynamic loads (vibrations), the screw clamp is preferred to be an all steel screw clamp. From 80 mm, the screw clamps are provided with loading of a patented anti-slip protection, which also guarantees safe support in contaminated rails. The handle is manufactured from a high-quality dual component plastic that is pleasing to the touch.