The Capri Tools Adapter and Reducer set instantly extends the capabilities of your ratchet and torque wrenches, letting you use sockets that have drive sizes different from your hand drivers. We use premium Chrome Vanadium steel tempered with our proprietary heat treatment process to make these adapters. They are durable and withstand more torque. Each item underwent careful polishing and protective plating process to achieve our own chrome finish. Spring-loaded ball detent holds sockets securely in place. Meets and exceeds ASME B107.110 standards. This set includes: 4 adapters and reducers: a 1/4 to 3/8 in. drive adapter, a 3/8 to 1/4 in. drive reducer, a 3/8 to 1/2 in. drive adapter, a 1/2 to 3/8 in. drive reducer.