9 Piece screwdriver Security Bit Set fits many tamper-proof screws for everything from laptop computers to cell phones. * Six point torx star style bits * Tips have tamper-proof security hole in center * Sizes: T-10, T-15, T-20, T-25, T-27, T-30, T-40, T-45, T-50 * Same as: T10, T15, T20, T25, T27, T30, T40, T45, T50 * Length of arm is 2.25 inches for the T10 to 4.75 inches for the T50 * Sturdy thermoplastic holder. * High quality Chrome vanadium alloy construction