This sturdy set of tamper proof torx bits is made of chrome vanadium steel and is heat treated. Fits star fasteners with tamper resistant centers. Sizes: T5, T6, T7, T8, T9, T10 and T15 and 1/4in hex to 1/4in square drive adaptor. Plastic organizer. Hard to find! This is the one you need to fix your cell phone or iPod, etc.