PROLUBE 44847 Deluxe Steel Bearing Packer has rugged steel construction makes this ideal for greasing bearings in cars, boats, tractors, and RVs. Non threaded top cone for fast placement of bearings. This design incorporates grease nipples on the outer shaft which easily adapts to the grease gun coupler. Suited for bearings With a minimum ID of 1/2" To max 6" And height from 3/8" To 2".