Product Features Type of Shank: 1/4 inch hex shank ; Overall length: 2 Inch Length . 12 in 1 Professional Size: T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40. 12pcs screwdriver bit set. ( Note: T5, T6, T7 are NOT Security Tamper Proof Type) High Quality: S2 high quality steel. Magnetizable security head(New Bits with Weak Magnetic). After Magnetized with a magnet it would with a strong magnetic, can suck the screws easily when used it. Exquisite Workmanship: This useful screwdriver set, exquisite workmanship, each edge can be accurately locked screws, no damage to the screw, and the screwdriver head.Such a practical aid in many situations. Widely Application: It can be used with electric screwdriver, manual screwdriver, electric drill, group general tools,and any Standard Drills . Note T5, T6, T7 are NOT Security Tamper Proof Type Product Specification Type12pcs Drill Bit Set Material S2 high quality steel Quantity12Pcs SizeT5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40 Overall length2 inch Type of Shank1/4 inch hex shank FeatureMagnetic,Exquisite Workmanship Application electric screwdriver, manual screwdriver, electric drill, group general tools,and any Standard Drills Package Included 12 x Drill Bit Set