Wiha 33494 - Soft Grip Ball Hex Dual Drive T-Handle Black Finish 11 Piece Inch Set. CVM steel, hardened, black finish. Ball tip for speed & easy insertion. Wiha soft grips are molded on with through the handle side torque drive. Set Includes: 5/64*, 3/32*, 7/64*, 1/8*, 9/64*, 5/32, 3/16, 7/32, 1/4, 5/16, 3/8 *No Ball - Standard Hex
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.