Material:Bakelite Spherical knobs and lobe knobs with Bakelite From M5--M16 All black color Spherical knobs and ... long sleeve handle knobs SANKQ specialized in manufacturing professional with woodworking machine accessories more than 10years.such as digital ... indicators, indicators, bakelite handle and knob, lobe ball knobs with brass insert , long knobs,adjustable handle , zinc alloy adjustable ...