Exquisite and professional workmanship makes it wear-resistant and not easy to rust. The elastic ball spring design makes it safe to use and prevent falling off. Its 360-degree rotating head makes it have flexible operation in small spaces. And the recessed interface makes it easy to insert the wrench. Made of chrome vanadium steel material, it is very durable to use. There are three specifications compatible you to choose from: 1/2, 1/4, 3/8. It is suitable compatible bicycle maintenance, home maintenance, factory maintenance, automobile maintenance and so on. Item Name: Universal Adapter Material: Chrome Vanadium Steel Features: Wear-resistant, Recessed Interface, Anti-dropping Size Details: 1/2: 7cm x 2.4cm/2.76" x 0.94" (Approx.) 1/4: 4.35cm x 1.48cm/1.71" x 0.58" (Approx.) 3/8: 5.4cm x 1.8cm/2.13" x 0.71" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Universal Adapter