Perko Black Flush Lock Made 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 2-38 diameter hole, on mounting surfaces 38 - 78 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