KIPP K0253.4105X20 SPHERICAL KNOB SIZE:4 D1=50 D=M10X20 THERMOPLASTIC BLACK RAL7021 COMP:STEEL CAP:GRAY RAL7035 Product description: An ergonomically perfect product for a three dimensional grip, with a spherical surface that has vertical ribs to reduce slipping. Fulfills the requirements of diverse application sectors. Material: Black thermoplastic. Screw grade 5.8 steel or 1.4305 (AISI 303 equivalent) stainless steel. Version: Steel trivalent blue passivated, stainless steel bright.