Hex Key Set 1) Made of Mild carbon steel, Cr-V ... or M2 steel, 2) Surface nickel plated or zinc plated Hex Key Set1) Made of Mild carbon steel, Cr-V steel ... , electrophoresis finished, chrome plated or matte finished.3) Point head to be Hex/hex, hex/ball point, torx-torx, torx-torx with hole4) Packing ...