A simple-push button release permits instant removal of expensive electronic instruments to prevent theft. Top unit can be rotated, 360° and automatically locks into 45 different positions. Molded from tough DuPont 6/6 nylon. Pre-assembled with stainless steel springs and screws, maintenance free. 4-3/4"Lx2-1/8"W. Accommodates the hole patterns for popular Lowrance Electronics sonar units.