Feature: *Made of Chrome-molybdenum steel, the overall induction hardening, not to wear. *Fit for factory, repair shop, furnishing and repair work. *lt can also be used withhand tools, such asDafei speed wrench,Dafei L-type wrench,and Dafei slider wrench. *1/2''(12.5mm) square interface, hexagonal head, the sizes are: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 17mm, 18mm, 19mm. The total length is 80mm. Specifications: Product Name: Electric Drill Socket Adapter Material: Chrome-molybdenum steel Color: Black Length: (Approx. ) 80mm Adapter: 1/2''(12.5mm) Head Stype: Hexagon Head Size: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 17mm, 18mm, 19mm Optional Model: H4, H5, H6, H7, H8, H9, H10, H11, H12, H13, H14, H16, H17, H18, H19 Suitable for: factory, repair shop, home furnishing and repair work. Quantity: 1pc Package Included: 1 Socket Adapter Note: 1.Transition: 1cm=10mm=0.39inch. 2. 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. 3. Please allow slight manual measurement deviation for the data. _x000D_