Features:* Heat treated, durable, has high hardness, not easy to wear. Make sure you choose the right drill bit and control the correct drilling speed. This operation greatly prolongs the service life of the Allen tip.* The hardness can reach HRC60 degrees. The hex wrench set fits electric drills with variable speed devices, electric screwdrivers, manual screwdrivers. Please do not use the drill bit for pneumatic tools, air shivers and electric drill without speed adjustment. The long life of the drill bit is achieved due to its durable design and superior technology.* High quality, durability and durability. The hexagon drill bit set is clearly marked, that you can find what size you need quickly. Easy to take and use.* The hex screwdriver set is a little magnetic, which helps keep the nuts and bolts glued to them. It can improve work efficiency. Specifications:Product Name: ScrewdriversMaterial: S2 Stainless SteelColor: SilverLength: 100mmMagnetic: Yes Shank: 1/4 Inch Hex Head10pcs Size: 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/811pcs Size: 1/20, 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8Suitable for: Electric Drills with Adjustable Device Speed, Electric Screwdrivers, Hand-Made ScrewdriversQuantity: 10pcs/11pcsPackage Included:1pcs × 10pcs Screwdrivers Or1 × 11pcs screwdriversNotes:1. Transition: 1cm=10mm=0.39 inch.2. The actual colors 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.