... 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 ... galvanized finish for corrosion resistance. 6.typical working load limit of 6.25kn against slip at tightening ...