Fitment Fits driveline series 1610 to 1880 and nearly all other heavy-duty truck and machine type u-joints with bolt-retained bearing cups. Features: (1) Fits driveline series 1610 to 1880 and nearly all other heavy-duty truck and machine type u-joints with bolt-retained bearing cups. (2) Solid steel, heavy duty with high strength and toughness to ensure durability and perfect match; black powder surfase coated is good in rust resistant. (3) Specially Designed for quick and accurate installations on bolt-retained bearing cups. (4) Automatically aligns bearing cups during installation and reduce damage to the needle bearing. .