1.Roller lock 2.Stainless steel 3.Fireproof 4.For ... stainless steel, PVD stainless steelAccessories Striking plate Pocket ScrewsType 55ZR55ZR Roller Ball Locks (DIN 18250 Class 3;EN & CE 1121 ... and fireproof doors, etc. ,such as latch bolt locks, dead bolt locks, night latch locks, bathroom locks and emergency escape function ... etc..,so,the quality and service are pretty faithful. Roller Latch Lock