Bits machined from high quality chrome vanadium molybdenum tool steel; 60.33 average Rockwell hardness. . Includes 7-1/2" Flex-A-Bit flexible extension, #1 and #2 Phillips, 6-8 and 8-10 slotted, R1 and R2 square recess(Robertson), T10 and T15 Tee*Star (fits Torx screws), and magnetic bit holder.