This KAKU Professional Tools 9-Piece Hex Key Wrench Set is a reliable, high-quality kit for mechanics, DIY enthusiasts, and professionals. Made from CR-V (Chrome Vanadium) steel with a hardness of 50 HRC, these keys are built to withstand high torque without rounding off. The set includes 9 metric sizes ranging from 1.5mm to 10mm, neatly organized in a compact, folding holder for easy storage and quick access.