... . insert: brass, stainless steel ISO9001 qualified Features: Dongguan Plastic Ball Knob furniture hardware A.Product specifications1.Screw sizes:M4, M5, M6 ... , M8, M10, M12, M162.Knob Sizes:16mm,20mm, 25mm, 30mm, 32mm.3.Knob Material:Plastics, bakelite, zinc-alloy steel, polyamide4 ... with the good quality and competitive price. Dongguan Plastic Ball Knob furniture hardware