... 19mm, 21mm, 22mm, 23mmCertificationISO9001:2000, CE, SGS British Type Forged Scaffolding Internal Joint Pin :1) Material: Q2352) Surface: Zinc ... Zhangjiagang City Luding Hardware Products Co., Ltd. is a professional manufacturer for scaffolding coupler,including drop forged coupler and pressed ... us.We produce high quality couplers, in both drop forged and punching procedure, in according to EN74 and ...