Product description Material: chrome vanadium alloy steel Size: 100mm (8pcs), 150mm (8pcs), 100mm (10pcs) Whether it's magnetic: yes Package content: 1 set of hollow plum bits with hexagonal handle 1.High QualityMagnetizable Torx head screwdriver bits are made of excellent industrial grade S2 steel material for superior hardness that reduce wear-outs and ensure longevity, which is stronger and more durable than others. 2.Strong Magnetic& High PrecisionMagnetizable Torx head screwdriver bits can be easily keep screws stuck to them,can improve your work efficiency; Each edge of the torx bit can be accurately locked screws, no damage to the screw and the screwdriver head. 3.Professional Size8/10pcs torx screwdriver bit set can be used with any 1/4" hex shank electric screwdriver, manual screwdriver, electric drills, group general tools, etc. 4.Wide ApplicationsTorx Bits are prefect for repairing automobiles, motorcycles, and bicycle brake systems (disc brakes), hard disk drives, computer systems and consumer electronics. It will be very convenient and necessary for your daily life. 5.Exquisite WorkmanshipThis torx security tamper proof star bit 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.