Screwdrivers, Nut Drivers & Socket Drivers Sys 4 Torx Micro Bit T6 x 28mm (1 piece) Micro Bits precision machined exact fit tips. Made from High Performance CRM72 Modified tool steel. Through hardened for long term performance. Small 4mm drive is ideal for Electronics, Optical, Precision tooling, all bits 28mm long. Made In Germany