... 2.Using condition:-45~80degree. Concealed door closer,passed EN1154 test 500,000 cycles,suitable for timber or metal door Description1 ... .Concealed door closer,passed EN1154 test 500,000 cycles.2.material:aluminum alloy.3.Using condition ... welcome . Wish we can set up business relation in the future. Concealed door closer,passed EN1154 test 500,000 cycles,suitable for ...