Grease Gun with 3oz Cartridge by SierraHeavy duty all steel construction for dependable, long service life.Features: Rigid and flexible line.; 3oz Grease cartridge.; Pistol grip for easy, one-hand operation.; Compact size-perfect for hard to reach jobs, and quick marine service work. ; Loading: Remove head cap; Pull plunger rod and lock; Remove cap from end of cartridge and insert in barrel; Pierce and remove center foil with sharp object; Replace head securely; Unlock plunger and slowly push into barrel ; Unscrew head cap about one turn to release air pocket. Re-tighten head. ;