Premium stainless steel material, firm, corrosion and durable to use. Extend service life, keep dirt and water out of your hubs and bearings. If you have questions about the product, please contact us and we will reply your information within 24 hours to provide you with purchase suggestions. Thank you. we will serve you 24 hours The automatic check function indicates the level of grease to prevent grease failure. Most tailor-made hub bearings have a 1,980-inch hub diameter. 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. Easy to install, but professional installation is recommended. A great replacement accessory for the old one. Load more conducive to trudge uphill, installation is simple and practical and reliable cost-effective. Specification: Condition: 100% Brand New Item Type: Trailer Bearing Buddy Material: Stainless Steel Color: As picture shown Bearing Buddy Bottom Size: Approx. 2.441in Application: Designed to be used in most 6 boltshubs.