... test 500,000 cycles,suitable for timber or metal door Description1.Concealed door closer,passed EN1154 test 500,000 cycles.2.material ... ,black,brown,brown,gold 5. suitable for timber or metal door.6.item No.: 4022,4023,4302,4303,4304.Built-in ... we can set up business relation in the future. Concealed door closer,passed EN1154 test 500,000 cycles,suitable for timber ...