Designed for impact or hand tool use. Magnetic retention device keeps the adapter attached to the socket. Adapters can be stacked if additional drive reduction is needed. Sleeve type, low profile. This 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.