Top of the line grease gun designed for heavy industrial applications; Variable half-stroke built-in for use in confined areas; 10,000 psi / 690 BAR; Air bleeder valve; Bulk filler fitting; 12\" flexible hose and 6\" steel extension with professional 4-jaw coupler; Built tough with aluminum die-cast head; Large rolled threads for fast and easy 3-way loading; Follower plate locks to help loading; For use with 14 oz. grease cartridge or bulk grease; 28 Strokes Per Ounce