Three-Flute Countersink Drill 4.5-50mm 3 Flute Countersink Drill Bit 90 Degrees HSS Chamfering Cutter High Speed Steel Metal Hole Drilling Tool(Sliver,20.5mm)

Specification:Type: Countersink Drill BitMaterial: High Speed SteelDegrees: 906Pcs Set:6.3mm 8.3mm 10.4mm 12.4mm 16.5mm20.5mmSize Including: 4.5mm 6.3mm 8.3mm 10.4mm 12.4mm 16.5mm 18mm 20.5mm 25mm 30mm 35mm 40mm 50mmPackage Including:1pc Countersink Drill Bit==========Origin : ChinaMaterial : High Speed SteelType : Countersink Drill BitUse : Metal Drilling

• [Precision-Ground Cutting Edges]：CNC-machined triple-flute design with 90° chamfer angle delivers razor-sharp cutting performance. Titanium nitride coating enhances hardness to HRC 62-65 for extended tool life.
• [Enhanced Material Compatibility]：M35 cobalt steel construction withstands temperatures up to 600°C. Processes stainless steel, carbon steel, non-ferrous metals, and composite materials with hardness up to HRC 35.
• [Vibration-Reduced Operation]：Five-flute geometry with spiral chip channels minimizes chatter during operation. 1/4" hex shank ensures secure grip in all standard chucks with ±0.1mm runout tolerance.
• [Comprehensive Size Range]：Six most-used sizes from 1/4" to 3/4" cover 90% of common applications. Laser-etched markings maintain permanent size identification despite heavy use.
• [Usage Advisory]：Apply cutting fluid when processing hardened metals. Maintain 1500-3000 RPM for optimal performance. Store in original case to prevent edge damage. Replace when cutting resistance increases significantly.