Lumax LX-4801 Gold/Silver (SAE) 1/4"-28 Taper Thread 8 Piece Grease Fitting Assortment Passivated finish for maximum protection from corrosion Heavier wall thickness for extra strength Stress relieved and tempered carbon steel spring Ball check in head prevents dirt from getting in Fits LX-3007 (4 piece), LX-3013 (2 piece), LX-3019 (2 piece)