... 19mm, 21mm, 22mm, 23mmCertificationISO9001:2000, CE, SGS British Type Forged Scaffolding Internal Joint Pin :1) Material: Q2352) Surface: Zinc Plating ... . is a professional manufacturer for scaffolding coupler,including drop forged coupler and pressed coupler. We have several kinds of ... us.We produce high quality couplers, in both drop forged and punching procedure, in according to EN74 and BS1139 ...