The Nitro SL is an ergonomic inverted mechanism of superior design, with one vertical and two horizontal mounting points. Sturdy construction with minimum profile and working length, minimum space required for installation within the body of the handle. It has a built-in automatic horizontal and bilateral line release which is on the back of the mechanism. The position of the line release at the back of the mechanism contributes to not reduce the strength of the body of the handle, while the user can place it on which side wants. Compatible with European-style shafts 6-10 mm. Ability to attach line in the tail of the spear (for 6-8 mm spears). Includes pins and a screw for secure mounting within the body of the weapon.