Harvey Tool 843509-C6 | 0.1406" (9/64) Diameter x 0.2500" (1/4) Shank x 0.4250" LOC x 2.5000" (2-1/2) OAL 6 Flutes AlTiN Nano 2 FL Coated Carbide Hardened Steel Ball End MillDesigned to mill hardened tool, die, and mold steels up to 55 Rc, this offering of End Mills for Hardened Steels Ball For Steels. Increased shank diameter to maintain strength and stiffness h6 shank tolerance for high precision tool holders Designed to mill hardened tool, die, and mold steels up to 55Rc Ball profile for maximum strength CNC ground in the USA Center cutting Solid carbide Product Specifications Tool Number 843509 C6 Cutter Diameter