Solid Carbide Internal Coolant Twist Drill, Tungsten Carbide Coolant Hole Drill Bit, Through Coolant Hole Design for CNC High Hardness Metal Drilling, OEM Custo

Solid Carbide Internal Coolant Twist Drill, Tungsten Carbide Coolant Hole Drill Bit, Through Coolant Hole Design for CNC High Hardness Metal Drilling, OEM Custo. Solid tungsten carbide substrate, high hardness and excellent wear resistance for high-speed CNC machining. Internal coolant hole design, direct coolant delivery to cutting edge, reduce heat and extend tool life. Precision ground flute, smooth chip removal, support custom diameter, length and coating.