There is not allot to say about grease gun tips in general. FROM Wikipedia: A grease fitting, grease nipple, Zerk fitting, grease zerk, or Alemite fitting is a metal fitting used in mechanical systems to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun. This is WELL constructed and SOLID. It comes with all sorts of goodies. I cannot see myself ever needing more than one but I have two. I was impressed how well it stayed on the zerk fitting - I tested it with a 5,000# meter, just something to do. It locked on and stayed on at 5000 PSI. Good enough for my occasional use! I would imagine it would be fine for some of the larger jobs. Not everyone gets to see bearings the size of a Volkswagen get greased. Makes a mess when the fitting comes loose. I do use the needle to inject grease in some parts so this is a plus. It is nice to put it where I need it. I can use this for many different applications where grease would be needed. Having these two grease adapter tips just helps get grease into other joints and things without grease fittings. Like lawn equipment or stuff that stays outside most of the time. Gate hinges? Stuff you want to keep lubricated. This little kit is a time saver. Good deal too.