Ko-ken 168T/7(TH) Screwdriver TORX T10H-T40H Tamper Resistant 7 pieces. TORX® is recognized as one of the three most efficient fastening systems because of their ability to transfer greater torque, reduce load and virtually eliminate tool slippage. Includes: Tamper-resistant TORX Screwdrivers 168T-T10H 150mm long 168T-T15H 150mm long 168T-T20H 225mm long 168T-T25H 225mm long 168T-T27H 235mm long 168T-T30H 235mm long 168T-T40H 245mm long.