Features:* 【Allen wrench drill bit set includes 7 most popular metric sizes】 2mm,2.5mm,3mm,4mm,5mm,6mm,8mm. Shaft Parts Set: 6.35mm/ 1/4", Length: 75mm(3").* 【High Quality】Heat treated, durable, has high hardness, not easy to wear. Make sure you choose the right drill bit and control the right speed of the drill bit. This operation greatly extends the service life of the hex drill bit.* 【The professional Allen bit set is made of S2 alloy steel, very well made and as strong as nails】- 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 service life of the drill bit is achieved because of its durable construction and excellent technology.* 【Surface Nickel Plating, Super Anti-rust 】 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.* 【Magnetic Bits & 100mm Length】- The hex screwdriver set is a little magnetic, which helps to keep the nuts and bolts glued to them. It can improve work efficiency. Length 100mm(3.94"), longer than the market, more practical and comfortable. Package Contents:7pcs x Hex Bolt Allen Bits