This T55 Torx insert bit is made from S2 Tool Steel with proprietary heat treat for superior strength and durability. Commonly found on BMW, Audi, VW, other European vehicles, and even many Ford/GM products, this T55 Torx bit insert fits in any 1/2" shank bit holder or socket to help you get the job done. Mayhew Torx bits have a precision tip profile for positive and precise fastener engagement. This bit is also fully turned, ensuring the shaft never gets in the way even on the tightest job. Socket bit is clearly marked with size for easy identification whether it is part of a set or stored individually.