Lisle 26550 9pc Torx Bit Set. All torx bits are made of heat-treated alloy steel. Sizes: T-10, T-15, T-20, T-25, T-27, T-30, T-40, T-45, T-50. T-50 sizes for servicing disc brakes fitting GM and Ford brake caliper Torx bolts. T-10 through T-30 are 1/4" Drive. T-40 through T-55 are 3/8" Drive. T-60 is 1/2" Drive.