Feature: * Made of chrome molybdenum steel, general induction hardening, not easy to carry around. * Fit for factory, workshop, home furnishing and repair work. * It can also be used with hand tools such as Dafei speed wrench, Dafei L-type wrench and Dafei slide wrench.* 1/2" (12.5mm) square interface, hexagon head, sizes are: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 16mm, 17mm, 18mm, 19mm. 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, workshop, home furnishing and repair work. Quantity: 1pc Package includes: 1 Socket Adapter Note: 1. Passage: 1cm = 10mm = 0.39 inch.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.