Strong Screwdriver Cross Hardness Hand Electric Drill Screw Electric Screwdriver Set 25 50 65 70 90 150mm Strong Screwdriver Cross Hardness Hand Electric Drill Screw Electric Screwdriver Set 25 50 65 70 90 150mmFeatures:heat treated, durability, has hardness, not easy to wear.Professional bit set steel, very well made and as nailsHardness can reach HRC62 degree. Hex-key set fit for electric drills with speed regulating device, electric screwdrivers, hand screwdrivers.Please do not use drill bits on pneumatic tools, air dills, and the electric drill without speed regulation. A long of the drill bit is reached due to its and superior technology tips- and nickel plating surface-treatment, super anti-rust,long lasting and easy to use Specifications:Main Product: Cross Screwdriver Bits Set Steel Color: BlackSize:1/4 Inch 6.35mm Quantity：6PCS （25mm 50mm 65mm 70mm 90mm 150mm）Package Includes:6pcs x Screwdriver BitsNote:Please allow 0-1cm error due to manual measurement. please 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!