Movement of the lever is converted into an axial movement of the push rod, automatic stepless adjustment of the clamping width up to 13 mm with almost constant clamping force? without manual change of the pressure screw position, adjustable clamping force of up to 2500 N depending on the setting of the adjusting screw in the joint, stable, tempered metal sheets for a long service life, hole pattern of the base plate suitable for millimeters and inches, high-quality, oil-resistant 2-component plastic handle