Material Lever Steel, blackened Stainless steel 1.4305, dull blasted Inner parts Steel, blackened, quality 5.8 Stainless steel 1.4305, dull blasted Screw Steel, blackened, quality 5.8 Stainless steel 1.4305 Ball knob Thermosetting plastic PF 31, black, DIN 319 Operation By lifting the lever the serrations are disengaged. The lever can be positioned by the serrations. On releasing the lever, the serrations are automatically re-engaged. Notes The threaded portion can be exchanged.