A Rim Cylinder Follower with a .500" diameter is a standard rim cylinder rekeying tool with two different end configurations. Uses include: LICO, Kiel, Eagle, Lockwood, other rim cylinders. A Rim Cylinder Follower with a .500" diameter is a standard rim cylinder rekeying tool with two different end configurations. Uses include: LICO, Kiel, Eagle, Lockwood, other rim cylinders. Made from machined aluminum to exacting tolerances with a Blue anodized finish.