Bondhus 33832 Set of 8 Tamper Resistant Stardriver Tools, sizes TR6-TR25 Tamper Resistant Stardriver screwdriver sizes TR6, TR7, TR8, TR9, TR10, TR15, TR20, and TR25 Precision machined ends provide full engagement Tools are Made in the USA with Bondhus proprietary Protanium steel and are up to 20% stronger than competitor tools ProGuard&#65533; Finish is 5 times more effective than the next leading brand in preventing rust, protecting your investment over time Lifetime warranty - we will replace it free of charge