Specification: Material: S2 high quality steel Type of head: Hexagon Type of shank: 1/4 inch Length: 100mm Size: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Package Included: 10pcs 100mm Screwdriver Bits Feature: 【Excellent Material】 S2 high quality steel, this batch of head using S2 high quality steel, batch head surface for steel material color,from inside to outside are the same. 【Powerful Function】 Strong magnetic,can suck the screws easily when used it. 【Various Sizes】 Each handle is printed with a size for identification, including 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, the length is 4 inch(100mm) with 1/4 inch hex shank. 【Wide Using Application】 Can be used for manual electric screwdriver, screwdriver, drill, air and other tools. 【9 in 1 Professional Set】 Professional multi size package, hexagonal handle on the edge of 1/4 inch.4 inch length. Use different sizes to screw, will damage screwdriver and the screw! Using the correct screwdriver bar, pay the less effort, and can easily unscrew the screws!