External Coolant Drill 3 Times Drill Diameter Dr-3D Solid

External Coolant Drill 3 Times Drill Diameter Dr-3D Solid. Optimized external coolant groove design delivers smooth chip evacuation, no complex internal cooling structure required, compatible with all standard CNC lathes & machining centers, greatly reducing. Adopts premium ultra-fine grain carbide blank with advanced bronze coating, excellent wear resistance and low cutting friction, stable performance for long-time continuous drilling on steel, stainless. Complete series with 3D and 5D standard length specifications, stable precision during deep hole & shallow hole drilling, perfect for heavy-duty rough and finish drilling of carbon steel, alloy steel.