One-hand-operation " The pistol grip allows for easy one-handed operation. Metallic Case " Makes it sturdy and durable. The tool can withstand accidental drops. Sturdy Construction " The Aluminum Die Cast Head is solidly constructed for long life. Smooth Operation " The grease flows out smoothly without any difficulties. Aluminum Die-cast head incorporates Bulk loader and Air Bleeder valve. Comes with 4 in. steel extension and 4 jaw coupler. Pressure 5000 psi Type Pistol Type Bulk Capacity 500 cc Cartridge Capacity 400 g