... The wedge fixing of the ledgers and transoms gives a simple and fast means of erecting access ... or as required.2.Standard:EN74, BS1139 and/or AS1576.3.Modules:standard,ledger,diagonal brace ... ,transom,bracket,steel plank and so on.4.Surface treatment:HDG,EG, ... require.5.Loading ability:with our self-contained laboratory and experienced technicians,we can provide the test ...