Solid Carbide Twist Drill Bit with Internal Coolant Hole for CNC Machining

Solid Carbide Twist Drill Bit with Internal Coolant Hole for CNC Machining. Internal Coolant Hole Design Built-in coolant channels deliver direct lubrication to cutting edges, effectively dissipate drilling heat and clear chips, reduce tool wear for long service life. Solid Carbide Substrate Made of premium solid carbide material, achieves high precision hole drilling on hard-to-cut metals, stable performance from low to high cutting speed. 3D Length-to-Diameter Twist Drill Geometry Optimized 3D flute structure balances rigidity & chip removal, widely compatible with P/M/K/N/S series metal materials for universal machining.