Don't be fooled by the low price, this is a quality air powered grease pump. It comes with everything needed except an air compressor, including a high pressure hose and a gun that can be fitted with grease nozzles. Holds up to 3 gallons of grease, you can fill it with slightly more, but then the pump and lid become difficult to get on the bucket. The bucket is straight all the way down, unlike plastic 5-gallon buckets that are usually slightly tapered. The steel construction is not perfect, but it's plenty sturdy enough. The holes for the casters are not threaded, you put them through and then secure each with a washer and locknut. This makes the base fairly adaptable if you wanted to use different casters. The holes could be drilled slightly larger if needed. The handle comes on backwards for shipping, just remove it, turn around, and re-attach. The piston has a large gasket all the way around. Does a great job squeezing all the grease out cleanly. This is good for greasing heavy machinery, or for refilling hand held grease guns. I have used it for both for several months, everything works great. No complaints. For the price, this is unbeatable.