QUALITY: Socket adapters are made of heavy-duty chrome vanadium steel for durability and long life. Durability: The surface of each adapter is finished by electroplating and blackening, which ensures corrosion resistance . Designed: The adapter body is designed with a ball bearing to prevent the socket from falling off when using. Convenient: These adapters are small in size and easy to to store for much convenience. 1/2" dr to 3/4" step up (1/2" dr ratchet or bar to 3/4" dr socket), suitable for impact gun use. corrosion, ready for weekend enthusiasts. Features: Socket adapters are made of heavy-duty chrome vanadium steel for durability and long life . The surface of each adapter is finished by electroplating and blackening, which ensures corrosion resistance. The adapter body is designed with a ball bearing to prevent the socket from falling off when in use. 1/2" to 1/4" (1/2" ratchet or 3/4" socket bar) - Suitable for use with impact gun. These adapters are small in size and easy to store for much convenience. Features: Material: Chrome Vanadium Steel Surface Finish: Electroplating, Blackening Hardness: 40 2 (HRC). Colour: Black. Socket Size: 1.27 cm (female) - 1.9 cm (male). Package: 1 plug adapter. Note: The data is manual measurement, please allow 1-31cm error, due to differences between light and screen, there will be a certain color difference, the specific received in nature prevail.