| Three Flute Countersink Bit | Single Flute Countersink Bit |
| Advantage: | Advantage: |
| Three Flutes Cutting,high efficiency,strong wear resistant. | Smooth surface after chamfered. |
| Application: | Application: |
| Chamering Mould Steel,Stainless Steel,Steel Rail and some other hard materials on TABLE DRILLS. | Chamfering Soft and Thin materials,deburring; Easy operation |
| NOT Suggest: | NOT Suggest: |
| Not for Soft and Thin Materails as Copper Sheet and Aluminum Alloy;DON'T install on Power Drills. | DON'T in high speed.The speed should be around 200rpm |