Yonico Solid Carbide Single Flute Upcut End Mill Router Bits CNC Spiral O Flute 1 2 Inch Diameter 1 2 Inch Shank 31019 SC 1 2" Diameter 1 1 8" Length 1 2" Shank Style:1 2" Diameter 1 1 8" Length 1 2" Shank Metric M3 M4 M5 M6 Color Name:Oil Rubbed Bronze Metric M3 M4 M5 M6 M8 M10 M12 Steel Sheath Coiled Wire Helicoil Type Screw Repair Insert Assortment Kit Widely Application: Great replacement for industrial and construction fasteners Premium C3 micro grain solid tungsten carbide for a high performance industrial quality tool Aluminum creates larger chips than most other materials and bits such as O flute end mills are recommended for proper chip removal