3-way Loading: cartridge, drum or bulk Heavy-duty spring for constant priming Follower rod lock for easy loading in any position Steel plunger handle Rated at 6,000 psi 28 Strokes Per Ounce For use with standard 14.5 oz. cartridges 6" steel extension with professional 4-jaw coupler Hardworking, entry-level model, designed for use in general lubrication and daily maintenance work