excellent raw material; strict size; easly for installation; long fatigue life; Surface treatment: zinc; sliver; nickel 1.About productMaterial:spring steel, stainless steel,zinc plating steel,carbon line,etcSize:As clients request.finish:Powder coating,neikel plating,chrome plating,zinc plating,etc and We can make according to your designUsage:instrument industry, lockset industry, toy industry, ...