Fewer jobs are as messy and time-consuming as greasing up rollers and bearings. Yet well-greased bearings are a necessity to keep vehicles rolling along correctly. The Powerbuilt Portable Bearing Packer is the easiest, fastest, and cleanest way to pack bearings with up to 3 -1/2 inches (89mm) outside diameter. The design also pushes out the old grease as it fills the bearing in one single operation. Fresh grease can be stored under the plunger for multiple uses, so it's ready when you need it. Reloading the fresh grease is simple with the included grease gun coupler. Included dust cover keeps grease and plunger clean between operations.