1.Brass Bushing/connectors 2.Size:1/2Fx3/4M--4Mx3F 3.CE & ISO9001:2000 certificate ... steel, aluminum, brass2. Very strict tolerance, can reach 0.002mm.2. Equipments: Normal lathe, Automatic lathes, CNC lathe, CNC center ... Surface finish: Zinc / nickel / chrome plating, hot galvanized, painting, PVC, Powder coating, decrement plating.4.Application:electronictoys,jewelries,decorative lighting,stationery ...