ITEM NAME:5pcs Tungsten steel Carbide End Mill 4 Flute 50MM Length Flat Bottom 6MM Shank 5pcs 4 Flute 6mm x 50mm End Mill Solid Car.(Material: Tungsten steel. 4) Made of Tungsten steel, high hardness, durable. Suitable for: die block steel,wrought iron, carbon steel, alloy steel, chisel tool steel, general iron material, etc. Length: approx.