The YG-1 E5065 uncoated carbide extra-long-length square nose end mill has four flutes, a center-cutting design, and a 30-degree helix angle for general-purpose machining on hardened and high-alloy steel, chromium-nickel steel, steel casting, malleable cast iron, brass, copper, aluminum with a high percentage of silicon, and abrasive plastic. Extra-long-length end mills have longer cutting edges than long-length end mills for applications with a high depth of cut. (Feed should be reduced by around 50%.) Four flutes produce a better finish than fewer flutes. The tools square end creates sharp, unrounded cuts. The center-cutting design has cutting teeth at the end of the tool, so it can be fed into the workpiece like a drill bit. The 30-degree helix angle supports general-purpose applications. It balances lower angles strong cutting edge for difficult-to-machine materials with higher angles increased cutting action. Carbide is harder than high-speed or cobalt steel, making it more wear resistant at high speeds and providing longer tool life. With no coating or surface treatment, this uncoated tool can be used on a broad range of materials. Cutting diameter tolerance is + 0.0000 to - 0.0012". The round shank accommodates a range of tool holders. End mills are designed to remove material and create multi-dimensional shapes and profiles. They have cutting edges along the outside diameter and flutes that remove chips from the cutting area and allow cooling fluids to enter. If heat is not reduced effectively, the tools cutting edges will dull and additional material buildup can occur. The number of flutes can range from two to eight. Two-flute designs offer the most efficient chip removal, but more flutes provide a smoother finish. The shank is the end of the tool held in place by a tool holder or machine. Center-cutting end mills can create three-dimensional shapes and profiles, and make plunge cuts similar to a drill bit