SpecificationPerfect for use on trucks, vans and RVs. For converting jaw-type lube couplers to steel needle points. Dispenses fine line of grease through the needle nose.Includes both small and large sleeves to fit all standard couplers. Overall length 1-18", tip diameter .046", body diamter .250". For hand operated grease guns only.Plews/LubriMatic grease fittings are precision engineered to withstand the rugged use of most automotive, farm and industrial applications.