2 reducers: 3/8" Female x 1/4" Male, 1/2 inch F x 3/8" M and 2 Adaptors: 1/4" F x 3/8" M, 3/8" F x 1/2" M Made of premium chrome vanadium steel with a protective black oxide finish Spring loaded detent balls securely latch onto sockets, preventing them from being dropped Through-hole in drive ends locks onto drive tang Suitable for use with air pneumatic, electric impact wrenches and ratchets 4pcs Cr-v Impact Socket Adapter and Reducer Set for Impact Driver Ratchet Docket Extentsion Conversion Tool Engineered for use with impact drivers. Impact Adapter and Reducer Set multiply the range and capability of your existing socket system, giving you more options for dealing with the unexpected. Feature: Corrosion-resistant nickel/ chrome plated finish CRV Constructed of high-strength, heat treated chrome vanadium Knurled base improves grip during repairs Spring-loaded detent balls securely latch sockets Adapters meet and exceed ANSI/ASME standards Package Includes: 3/8 in. drive (F) to 1/4 in. drive (M) reducer 1/2 in. drive (F) to 3/8 in. drive (M) reducer 1/4 in. drive (F) to 3/8 in. drive (M) adapter 3/8 in. drive (F) to 1/2 in. drive (M) adapter