Designed for impact or hand tool useMagnetic retention device keeps the adapter attached to the socketAdapters can be stacked if additional drive reduction is neededSleeve type - low profileLifetime WarrantyThis reducing adapter set helps to reduce larger drive sizes down for use on smaller drive tools. The set contains 938RA 1/4" Female x 3/8" Male, 1138RA 3/8" Female x 1/2" Male, and 2238RA 1/2" Female x 3/4" Male.