1Premium stainless steel material, firm, corrosion resistant and durable to use. 2The automatic check function indicates the level of grease to prevent grease failure. Most tailor?made hub bearings have a 2.441?inch hub diameter. 3Extend service life, keep dirt and water out of your hubs and bearings. 4Easy to install, no complicated tools required, convenient for using. 5Bearing buddys put a small amount internal pressure in the hub (about 3psi). When the hub is submerged water cannot enter the hub because of this pressure.4 xTrailer Bearing BuddyCondition: New_x000D_Item Type: Trailer Bearing Buddy_x000D_Material: Stainless Steel_x000D_Color: As picture shown_x000D_Bearing Buddy Bottom Size: Approx. 2.441in_x000D_Application: Designed to be used in most 6 boltshubs. _x000D_Product Tolerance: -0.02 to -0.05mm_x000D_Instruction:_x000D_Bearing buddys put a small amount internal pressure in the hub (about 3psi). When the hub is submerged water cannot enter the hub because of this pressure. Its a great way to extend bearing life and service your bearings in-between hub re-packs. Bearing Buddy's help keep dirt and water out of your hubs and bearings. The blue indicator ring will protrude out to let you know when your bearing buddy is full, or sink back in to let you know that you need to add grease. 1Premium stainless steel material, firm, corrosion resistant and durable to use. 2The automatic check function indicates the level of grease to prevent grease failure. Most tailor?made hub bearings have a 2.441?inch hub diameter. 3Extend service life, keep dirt and water out of your hubs and bearings. 4Easy to install, no complicated tools required, convenient for using. 5Bearing buddys put a small amount internal pressure in the hub (about 3psi). When the hub is submerged water cannot enter the hub because of this pressure.4 xTrailer Bearing Buddy