Feature:1. Suitable for a screwdriver handle or electric screwdriver tool (hexagonal hole or three‑jaw chuck) drive sleeve to use.2. These adapter will make your work more convenient and labor‑saving.3. Made of high quality chrome‑vanadium steel material, high strength, abrasion resistance and durable.4. After install the original hexagonal size can be converted to square head size,so use to install the sleeve, is a good accessory to convert.5. Exquisite details, fine craftsmanship, not easy to rust, safe and secure.6. These different drill bits, can meet different using needs, suitable for wood drilling.Specification:Condition: 100% Brand NewItem Type: Hex Drill BitsMaterial: Chrome-Vanadium SteelColor: BlackWeight: Approx.166g/5.9ozApplication: Wood DrillingShape: HexProduct Size: Approx. Turn 1/2in( 12.5mm) ,3/8in (10mm) ,1/4in (6.3mm) connectorConvert:1/4 x 1/4 x 50mm length-1/4in shank can be converted to 6.35mm/0.25in square head3/8 x 1/4 x 50mm length-1/4in shank can be converted to 9.53mm/0.38in square head1/2 x 1/4 x 50mm length-1/4in shank can be converted to 12.7mm/0.5in square head1/4 x 1/4 x 65mm length-1/4in shank can be converted to 6.35mm/0.25i square head3/8 x 1/4 x 65mm length-1/4in shank can be converted to 9.53mm/0.38in square head1/2 x 1/4 x 73mm length-1/4in shank can be converted to 12.7mm/0.5in square head1/4 x 1/4 x 25mm length-1/4in shank can be converted to 6.35mm/0.25i square head1/4 x 1/4 x 30mm length-1/4in shank can be converted to 6.35mm/0.25i square headPackage List:8 x Hex Drill BitsNote:1. Please allow 1‑2cm error due to manual measurement. Thanks for your unders