Bondhus 33834 Set of 8 Tamper Resistant Stardriver Tools, sizes T9-T40 Tamper Resistant Stardriver screwdriver sizes TR9, TR10, TR15, TR20, TR25, TR27, TR30, and TR40 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 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