... iron,ss304# ,1.0mm . Dorma floor spring , BF-84 , DOUBLE CYLINDER ,DOUBLE SPEED.Dorma floor spring Picture:Dorma floor spring Picture ... of our products have passed full inspection before shipment. These tests can prevent our defective products from entering the market, and ... Workshop in our Factory Relative patch fitting accessories : Heavy machine cylinder floor hinge for glass and wooden door JU-90