Material: Made of 40CR steel which makes it more durable. Size range: 9 metric screwdriver bits: 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm. Multifunction: 6.35mm universal hex shanks fit a quick change and locks firmly into standard chucks, suitable for all drills, screwdrivers and screwdrivers. Convenient Storage: Comes with a belt storage clip, easier to carry and store. Wide Application: Widely used in home DIY, auto parts, woodworking, professional machine repair, and more. Features: Sizes: this set includes 5, 6, 7, 8, 9, 10, 11, 12, 13 mm. Length: 40 mm Shank size: 6.35 mm (1/4 “) Color: silver / black. Material: steel. Content: Set of 9 Magnetic Nut Drivers. Note: this does not include other things, the color is based on the first picture and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!