Wiha 36997 - MagicRing PocketStar Fold Out Hex 9 Piece Set. High alloy CVM steel, hardened, molded ergonomic handle. Set Includes: 5/64*, 3/32*, 7/64*, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4in. * Standard Ball - No Ring
CVM or Chrome-Vanadium-Molybdenum steel is a special, high strength, high performance alloy. Chromium improves wear resistance, hardness and corrosion resistance. Vanadium also improves the grain structure for a tougher tool. Molybdenum improves impact resistance as well as increases tensile strength and elasticity to prevent tool breakage and snapping.