The rubber seal and boot under the T-Handle seal the lock cylinder preventing water intrusion. For smooth or carpeted surfaces Gasket included for smooth surface applications Stainless steel stem Lock model includes 2 keys Latch model is non-locking Easily installs in a 2-1/2" diameter hole for mounting surfaces 1/8" to 3/4" thick Image shown is the lock model with the offset cam bar Latch version has no lock cylinder under the T-handle and has the offset cam bar shown Black or white plastic body w/ chrome plated zinc alloy T handle