
High Quality Factory Direct Extra Long Drill Bits CNC Internal Cooling Carbide Drilling for Deep Hole. Customizable Length: Customizable up to 50x diameter length for deep-hole drilling needs. Internal Cooling: Effective cooling at cutting edge enhances performance and chip removal. High Precision: Ideal for alloy materials with minimum diameter of 0.6mm. Premium Materials: 100% original alloy rods from Guhring, Kennametal, and other top brands. Super Coating: Options include AlTiN, AlCr-based, TiSiN with hardness up to 3700 HV. Fast Delivery: 100% on-time delivery with lead time within 15 workdays. OEM Service: Customized production available according to customer drawings or samples. Wide Range: Standard models in stock with diameters D3-D25mm and various lengths.