Faithfull Professional Security Screwdriver Bits are designed for use with tamper-resistant, security TORX (Star) head fixings which have a small pin inside their drive recess to prevent the use of a standard TORX driver, tamper-proof fixings of this type are often found on electrical appliances. Manufactured from high-strength, heat-treated S2 grade steel. These bits are shock and wear resistant and feature precision machined tips to provide an optimum fit, helping to prevent screw stripping and cam-out and provide a long working life. Ref: UTTK12382