Nylon plastic adjustable levers with stainless steel components. Patented and made in the USA, adjustable hand levers WN 300.1 are the result of modern industrial design; Glass fiber reinforced thermoplastic with molded in metal insert. All such levers have proven to be ideal wherever parts have to be clamped in a confined space or in a particular lever position. The insert is connected to the lever via serrations which can easily be disengaged. Pulling the lever upward disengages the serrations, allowing it to be swivelled to the ideal clamping position. On releasing the lever, the serrations automatically re-engage. Maximum heat resistance of nylon plastic: 150 degree C (230 degree F). Black lever.