... sizes17mm, 19mm, 21mm, 22mm, 23mmCertificationISO9001:2000, CE, SGSBritish Type Scaffolding Single Coupler with EN74/BS1139 :1) Material: Q235 ... kinds of scaffolding couplers, includes German type, American type, Australian Type, Japanese type, Korean type, British type, and so on. All the ... functions, such as spigot support, deck retainer, toe board fixing, ladder bracket and so on. Double coupler ...