Material: Steel-sheet parts: Case-hardened steel C10, zinc-plated. Bearing pins: hardened, from size 350 case hardened. All moving parts lubricated with special grease. Handle with plastic sleeve, red, oil resistant. Note: A special feature of the horizontal clamp is its low profile in the clamping position.They are designed to avoid the operator's fingers being caught between the retracting clamping arm and the operating handle (safety distance). During the closing movement it is guided on both sides to prevent it from being affected by possible side thrusts. Version M: forked clamping arm. Version O: solid clamping arm. Attention: The clamping bolts and protective cap have to be ordered sperately. * Size 25 only available in version M.