APPLICATION: Inner Axle Seal Installation Tool for Dana 30, 44, and 60 Axles, works with Dana 30, 44 and 60 front differentials. MATERIOR: All components made of CNC Billet Aluminum/steel, excellent solid and durable with great rust and corrosion resistance for years of trouble-free use. FUNCTION: Designed for specific applications, to help you complete your repair, restoration or upgrade. Use Yoursme's Inner Axle Seal Installation Tool for ease of inner seal installation. INSTALLATION: Fit your seal to one side or the other of the puck ( the puck is designed to grab a variety of different seals). Place the other end against the opposite side of the differential and tighten the nut until the seal is in place