Designed to meet the demanding requirements of most Automotive, Agricultural, Industrial, Marine, Truck, Federal, and, Construction Equipment needs. Lumax LX-4841 Gold/Silver (SAE) 1/4"-28 Taper and 1/8" P. T. F. 100 Piece Grease Fitting Assortment. Fully hardened for extra durability and to protect them from wear due to constant use. Ball check in the head prevents dirt and grit from getting into the fitting. Heavier wall thickness for extra strength. Every fitting is individually inspected and batch tested to 5, 000 PSI. Thread rolled taper threads are stronger and durable due to hardening and toughening of threads. This is not achievable in a cut thread process, as the threads become brittle on the periphery. Dome type riveting completely covers the spring enabling the spring to be firmly secured in its place. Lumax is a manufacturer of lubrication and fluid management products. Our products, including grease guns, manual and electric pumps, funnels, drains, grease fittings, filter wrenches, and accessories, are built to the highest standards and incorporate many proprietary features. Lumax's mission is to provide professionals and consumers with innovative and high-quality products to get the job done right. Product development at Lumax goes beyond the physical product, to a deeper understanding of the end-users' needs. Engineered with the "user-in-mind, " Lumax products are built to the highest standards and incorporate many unique features that make work easier, faster and cost-effective. We have a passion for the design process. We listen to our customers and their ever-expanding requirements. Our unique products lead the field in design, quality, and performance.