[Wing Nut Driver] It is equipped with 5 butterfly nut screwdriver bits of different sizes. Inner diameter of hexagon socket: 10/12/14/16/18mm. Slot cutouts are 3.5mm (0.14 inch), 4.9mm (0.19 inch), 6.0mm (0.24 inch), and 8.0mm (0.32 inch). [Robust and durable] Made of high-quality -V steel, it has strong toughness, high strength, high wear resistance, long service life and anti-corrosion design. [Safe and efficient] When installing wing nuts/louvers or other projects, you just need to connect the nut driver to the electric drill, and then let the drill finish work. It only takes a few seconds to complete the work faster. Save time and protect your hands from injury! [Wing nut drill bit] This wing nut driver is the perfect tool for use with any drill (1/4 inch hex ). It is very suitable for installing hurricane louvers or other items, quickly and effectively fastening or loosening wing nuts, bolts, C-hooks, Q-hooks, sheep eye hooks. [Widely used] It is suitable for home DIY, auto parts, woodworking, garden, machine maintenance, etc. It is a good helper in your toolbox, and 5 different sizes can meet your different needs! Colour:silver Material:steel Package Contents: 5 x nut driver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.