This 7-piece set of tamperproof star keys come in sizes TS10 to TS40 and are manufactured with a round hole in the middle to match star and Torx screws that have a pin, which cannot be interfered with or changed easily. The set is ideal for ECUs and diesel fuel pump screws which typically fit the Torx tamperproof format. The key set is supplied in an organised clip for safe keeping and organisation. Features and Benefits The tamperproof star set comes in 7 sizes, ranging from TS10 to TS40 The set is manufactured from chrome vanadium for guaranteed durability and hardiness as well as corrosion and rust resistance Compatible with Torx screws Typical Applications The set is compatible with ECUs and diesel fuel pump screws which frequently use the security Torx (tamperproof) format