The level of security that Rim cylinders provide vary according to which one you choose and range from a very basic lock which has five pins right through to a high security lock which has about six or seven pins. They are usually attached as the face of a night latch and the security they give will also depend on what type of night latch you have. Rim cylinders are a great way to upgrade the security of your existing lock without having to change the whole lock. The key used for a Rim cylinder can be either a standard Yale type key or a high security key with a security card.