This Listing is Kodiak Part Number REBP2440AC. This listing is for a Pair of Kodiak Red Eye Bearing Protectors. This particular size is the 2.441" size. This will fit all standard 6 Lug Trailer hubs. Kodiak Eye Protectors come with a Limited Lifetime Warranty, included with your purchase of this pair. Kodiak Red Eye Bearing Protectors feature a one-piece housing with an O Ring seal, sealing the bearing chamber, keeping it water tight and protecting your trailers wheel bearings from dirt and other harmful materials. This Red Eye Bearing Protector contains a spring loaded piston for keeping this positive pressure seal in place. This process will also effectively pack your trailers wheel bearings. You will know your bearing chamber is full and the correct amount of pressure has been reached when the Orange Indicator Ring on the Center Piston is Exposed. If you would like to test this process, simply apply pressure on the Green Back portion of the piston, this will expose the Orange Fill Indicator Ring.