5Pcs Counterbore Set, M3-M8 4 Flutes Hss-Al Straight Shank,, Milling Cutter Brand new and high quality. Type: Counterbore End Mills Material: High-Speed Steel Color: As Picture Show Size: As Picture Show Package Included: 5Pcs Counterbore End Mills Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Material: Mill cutters are made of hard high speed steel, usually used to be assembled on milling machine. Size: It includes 5 sizes in one counterbore set(m3, m4, m5, m6, m8).Please refer to the size chart for detailed data. Feature: High toughness, abrasion resistance, high-speed cutting for the high hardness. Advantage: Reduces times of changing tools, improves machine actuator movement efficiency and save mold making time. Wide Applications: Suitable for milling of copper, aluminum, steel, cast iron, etc.An essential hardware tool for industrial.