Premium heavy-duty lever action grease gun for all users. Cast Iron pump head for unbeatable strength and durability. Knurled barrel for a non slip grip, painted to prevent rust and corrosion. Removable check valve for easy cleaning. Thumb release catch holds follower rod firmly in place for easy cartridge replacement. Vinyl coated handle for non slip use. Uses standard 14 oz grease cartridges or can be bulk filled. Variable stroke mechanism. Includes a 6" curved steel extension with coupler. Working pressure: 4,500 PSI. Max pressure: 10,000 PSI.