Lincoln Industrial Pistol Grip Heavy-Duty Grease Guns Rugged cast pump head for strength and durability. Jam-proof toggle mechanism prevents binding or accidental bending of plunger. Exclusive Flip-Over" follower allows a superior seal for either or bulk loading applications. Tough, resilient and impervious to lubricant. Extra-heavy follower spring insures positive priming and uninterrupted pumping action Pack of 1