Quick details: 1.materials: Aluminium alloy, iron, copper, brass,stainless steel,carbon steel,etc Surface treatment: zinc plating, chrome plating, nickel plating, anodization.   Specifications 1. Various kinds shapes and specifications 2. Size and style can be customized 3.High precision 4. Reasonable and competitive price     Application widely used in medical instruments, electronics,watch accessories, auto parts,optical products,phone components,glasses accessories,etc.