Designed to fit all conventional spearguns in the market with a tube of 26mm inside diameter Convert your speargun to roller or invert roller Anti-corrosive, UV radiation resistant polymer with zero water adsorption (powered by DUPONT) Metal parts made of inox steel type 316L marine Predator Long high precision trigger mechanism that offers great user sensitivity at maximum loads Soft trigger feel Max load 375 kg Accepts 6-9mm spear shafts Camera Mounting kit NOT included (ZESO Inox Camera Mounting kit sold separately)