Perko - Flush Mount Latch - Straight Cam Bar - 2.5" Hole - Black - 1092DP3BLK. The T - Handle drops down flush in either the open or closed (180 Rotation) position. (except with the offset cam bar positioned upward). The rubber seal & boot under the T - Handle seals the lock cylinder preventing water intrusion.. Features:. Black plastic and chrome plated zinc alloy. Straight cam bar. For surface thickness: 1/8" to 3/4"(0.3cm to 1.9cm). Face Plate O.D. - 3" (7.6cm). Installs in 2-1/2" (6.4cm) Diameter Hole