Easily Installs in a 2-1/2 Inch Diameter Hole for Mounting Surfaces 1/8 to 3/4 Inch Thick 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. Chrome Plated Zinc Alloy, Black or White Polymer "T" Handle Stainless Steel Stem Lock with 2 Keys Diameter Adjustment Inches: 3"