【Widely Used】Fits the Most Popular Sizes for Class 7 and Class 8 Over the Road Trucks and Trailers and Some Medium Duty Trucks. 【Unique Design】The driver is designed to hold the seals to make installation easier. Allows driving seals on hubs with deep brake drums without removing the drums. Reduce damage to other auto parts during maintenance. 【Function】Includes five drivers and handle extension for extra reach for driving seals on hubs with deep brake drums without removing the drums. 【Package Include】Stored in a plastic case.The Truck Hub Seal Installer Kit includes 61700 4-13/16″ Seal Driver, 61710 6-5/16″ Seal Driver, 61720 5-31/32″ Seal Driver, 61730 5-11/16″ Seal Driver, 61740 6″ Seal Driver, 61990 Case for 61850, 59520 Nut, 59530 Extension, 59540 Handle and 12830 Washer. Superior Material — These tools arrives milled from super-tough aluminum alloy. It has the capability of handling literally tons of pressure. CNC process precision manufacturing，sturdy and durable, impact-resistant, corrosion-resistant and wear-resistant for a long-term and reliable performance. Easier Work — Install the driver on the appropriate handle, then use the attached hardened washer between the driver and the handle to protect the aluminum driver.