Allows Sport HD and other waterproof cameras with standard tripod mount base to be mounted on spear guns with cylindrical shaft diameter between (1.1 to 1.6) inches / (2.8 to 4.1) cm. Features aluminum and stainless steel construction and adjustable to different configurations. Dimensions: 5.75″ x 2.75″ x 2.3″, Weight: 4.3 oz /122g. Model# SGM. Product specifications subject to change without notice.