Covering 8 most-common torx sizes: E6xE8, E10xE12, E14xE18, E20xE24. The star wrench kit applies to the installation and removal of car torx bolts. The proper length of the etorx wrench set can be operated in a narrow space. Wrench is made of chromium-vanadium steel and the surface is sandblasted with, very sturdy There are stamping dimension marks at both ends of the wrench for easy identification.