High corrosion resistance, the tip is hardened by an advanced heat treatment for enhanced durability.Features:Those bits are magnetic that can be firmly fixed on screwdrivers, fitting for electric screwdrivers, hand screwdrivers, electric drills, air drillsMagnetic bits are firmly fixed on screwdrivers.Material: S2 Alloy SteelBit Type: Five starShank Type: 1/4 Hex shankSize: T10 / T15 / T20 / T25 / T27 / T30 / T40 Color: SilverQuantity: 7pcs/setNote:No retail package.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package includes:1 x T10 Magnetic Star Shaped Screwdriver Bit1 x T15 Magnetic Star Shaped Screwdriver Bit1 x T20 Magnetic Star Shaped Screwdriver Bit1 x T25 Magnetic Star Shaped Screwdriver Bit1 x T27 Magnetic Star Shaped Screwdriver Bit1 x T30 Magnetic Star Shaped Screwdriver Bit1 x T40 Magnetic Star Shaped Screwdriver Bit