IJO1161 Features: * Quickly flushes out old grease and repacks bearings with less mess * The handy packer works on bearings up to 3-1/2” OD. * The grease stays in the tool cavity, not on your hands * To pack a bearing, place the bearing on the piston * Press down on the cap until the old grease is forced out and the new grease shows on top of the bearing * Handy Packer Bearing Packer Warranty: * Lifetime warranty does not cover abuse