Perko Black Flush LockMade of black polymer, with a stainless steel "D" ring handle, stem, and lock nut. Includes 2 keys and gasket, and 2 O-Rings for increased water resistance. It has position indicators to show open or closed position. Easily installs in a 2-3/8" diameter hole, on mounting surfaces 3/8" - 7/8" thick. No.1 with offset cam bar and flexible polymer strike. No. 2 with offset adjustable cam bar. No. 3 with straight cam bar and flexible polymer strike.Specifications: Face plate dimensions: 2-7/8" x 2-7/8"; Fits in hole with diameter 2-3/8"; For mounting surfaces 3/8" - 7/8"; Click here for Perko Black Flush Lock installation instructions.