Performance Tool W30820 T20 X 4" Professional Star Screwdriver With Magnetic Tip Star/Torx Size: T20 X 4" Ergonomic non slip molded grips for improved comfort and control. Chrome vanadium steel with corrosion resistant satin finish and magnetic tips. widely used for electronics repairing and smart phone,mac book,computer repairing Durable and sturdy construction ensure long life