I bought this for lubricating the zerk fittings on golf cars.  It works fine and is easy to load the grease cartridge.  I wish the extension had the swivel-type, zerk adapter so you can get into tight spots.  I used my old one...just removed it from that gun and installed it on the new one.  The extension that comes with this gun only allows straight on use.  A person may want to buy a flexible hose, or something similar, in addition to the this gun.