MaterialBody Steel, case-hardened, blackenedStainless steel 1.4305, nickel-platedScrew Steel, nitridedStainless steel 1.4021, heat-treated, nickel-platedGear lever handle Steel, ground, blackenedStainless steel 1.4305, dull blastedBall knob Thermosetting plastic PF 31, black, DIN 319OperationThe screw bolt and the washer are adjustable. Once screwed in, the clamping catch can easily be turned to the desired position. For Art. No. 22260.0250 .0251 and 22260.0450 .0451, the serration helps to put the clamping lever to the preferred position. NotesLeft turn type can be supplied on request.