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JW Winco's Quick release hand knob is used in such applications where the knob has to be completely removed and refitted very rapidly for re-clamping. The knob is tilted over the threaded spindle. When in position, the knob is brought into a straight position for mating of the two threads on the insert and spindle. The hand knob will then have to be turned only by a fraction of a rotation to achieve clamping. Maximum heat resistance of nylon plastic: 110 degree C (230 degree F). Hand knob: Matte black, glass filled nylon plastic; Hub: Zinc plated 12L14 steel, molded-in. RoHS Compliant.