This grease gun is an extremely durable die-cast construction and comes with a 4-jay coupler for superior grip and long term use. The "Lock-N-Load" technology allow the grease cartridge to be removed and a new one loaded at the touch of a button and a twist of the cannister. Comes with a flexible 12" extension, holds standard 14oz. grease cartridges, and features a spring loaded pistol for one hand use.