› 8-4mm-m42-high-speed

Cutting Hardness: HRC67-70, Drill Bit Diameter: 8.4mm / 0.33-inch, Flute Length: 75mm / 2.95-inch, Shank Diameter: 8.4mm / 0.33-inch, Total Length: 115mm / 4.53-inch; 1 x M42 High Speed Steel Twist Drill Bit M42 steel is high cobalt high-speed steel.