SpecificationFor use with either hand operated or power lube equipment. Threaded center post for positive locking of wheel bearing.For bearings having a minimum ID of 1/2" to maximum OD of 5", height of 1/4" to 2". Rugged steel construction.Plews/LubriMatic grease fittings are precision engineered to withstand the rugged use of most automotive, farm and industrial applications.