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 Colour: black Product includes: 4pcs Size: 3/8 in. drive (F) to 1/4 in. drive (M) reducer: 17*26mm 1/2 in. drive (F) to 3/8 in. drive (M) reducer: 22*37mm 1/4 in. drive (F) to 3/8 in. drive (M) adapter: 14*25mm 3/8 in. drive (F) to 1/2 in. drive (M) adapter: 18*36mm Notes Please allow 1-3cm error, due to manual measurement, please ensure you don't mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual colour of the item. Thank you for your support!