Five sided star TS Bits are now required for some diesel injection pumps, ECU's on Rover, Renault & Peugeot plus air conditioning units on Mercedes Benz. Also found on some Massey Ferguson vehicles and refridgeration wagons. Manufactured in tough S2 material in 1/4"D and covering sizes TS10/15/20/25/27/30/40. This tamperproof set comes complete with a socket rail.