Fangrui Product Details [titanium Coating]these Twist Drill Bits Are Crafted From High-quality Hss Material And Coated With Long-lasting Titanium, Ensuring That The Cutting Edges Remain For A Longer Period To Meet All Your Requirements. [advantage]with A Fully Ground Spiral Groove Design, These Drill Bits Minimize Friction And Heat, Enabling A Cooler And Faster Drilling Action. [enhanced Efficiency ] Our Drill Bits A Pointed Central Serration, Greatly Improving Chip Evacuation, Thereby Increasing Overall Drilling Efficiency And Making The Process Smoother And Quicker. [applications]whether You Are Working With A Thin Board, Wood, Aluminum Alloy, Plastic, Or Engaged In Groove Processing, Our Twist Drill Bit Set Is The Tool For The Job. Colour:gold Material:metal Size:3mm, 4mm, 5mm, 6mm, 6.5mm, 8mm Package Contents: 6x Spiral Saw Drill Bit Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Differe