This adapter set for OTC Back Buddy II Brake Drum and Hub Assembly Dollies is designed for use with 5 and 6 spoke hub and drum assemblies. simply invert the adapters to change from 5 spoke compatibility to 6 spoke compatibility. Changing adapters on the Back Buddy II is easy - simply pull the spring-loaded pins on the U-Frame Assembly, insert the adapters into the rectangular slots then release the pins, locking adapters in place. High-grade materials ensure quality performance over the lifetime of the adapter set. Set contains 2 adapters. Value is at the core of the OTC tool and equipment portfolio. Whether it’s a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.