1.Concealed door closer,passed EN1154 test 500,000 cycles,suitable for timber ... 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 ... the future. Concealed door closer,passed EN1154 test 500,000 cycles,suitable for timber or metal door ...