... 2.good bearing capacity British Type Scaffolding Single Coupler with EN74/BS1139 :Type: Forged Single coupler Single coupler ... , 22mm, 23mmCertificationISO9001:2000, CE, SGSBritish Type Scaffolding Single Coupler with EN74/BS1139 :1) Material: Q235,2) Processing method: drop ... special couplers are used for special functions, such as spigot support, deck retainer, toe board fixing, ladder bracket and ...