Features: *It allows you to mix and match drive sizes for your sockets, ratchet handles, extension bars and other accessories. *Very handy tool accessory that adds versatility to your sockets. *Play function of transforming square head size to fit more size. *Durability: Made from Hardened treated Chrome Vanadium steel alloy *Corrosion-retardant Black Phosphate Coating. *Locks onto Drive Tang and Socket. *Ideal tool for mechanics, engineers, carpenters or DIY enthusiasts Sprung Ball bearing fitting retainer. Specifications: *Material: Chrome Vanadium steel *Color: Black *Process: Electrophoresis / Blacken *Size: 1/2" (F) x 3/8" (M), 3/8" (F) x 1/4" (M), 3/8" (F) x 1/2" (M), 1/4" (F) x 3/8" (M) *Dimension: 35 x 21 mm (H x Dia)(Max) *Quantity: 1pc Package Contents: 1*Socket Adapter Notes: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Made of high quality material,durable and practical to use. Perfect price-performance ratio, save you more money. The products is manufactured after strict screening, which is trustworthy. We will ship it ASAP,when you place the order. If you have any questions,please feel free to contact us, we will solve it for you immediately.