Brass keysfor locksmith to make the new key.Knock the cylinder before use to prevent the copper scrapes stuck inside and cause it be jammed. Cylinder lock inner with Safe Pins,more security.Suitable for the storm door ,patio sliding door locking handle set systems and door which use profile lock cylinder. Easy to installation:take out the old one , put in the new lock cylinder,and fix it with the screws.We using the M5*60MM screws. The door lock cylinder is the replacement parts ,can suit for the door which use profile lock cylinder. These door locks are suitable for all door types including wooden, metal, patio door lock, composite doors. They can be used as replacement locks or where new installation is required., Manufacturer: KUAYEOCF