... several kinds of scaffolding couplers, includes German type, American type, Australian Type, Japanese type, Korean type, British type, and so on. All the produces ... 2.tightening nuts suit standard scaffold spanner 3.replaceable "t" bolts,nuts and washers. 4.robust design ade from ... tightening nuts suit standard scaffold spanner.(23mm) 5.replaceable 't' bolts,nuts and washers. 6.robust design made from ...