The Cal-Van Tools Bolt Retained Bearing Cup Installer, No. 18510, easily and quickly installs U-joint bearing cups and series 1610-1880 yokes on Class 6-8 vehicles. It features two guide bolts, utilizing the bolt holes of the yoke, to achieve proper alignment with each use. The installer eliminates the risk of damage to cups, seals, or needle bearings, and the tool is impact-rated.