PRECISE CUTS: The precision drill bits The HCV/CV wood drill bits feature a special TopCut design that guarantees precise and clean cuts on different types of wood. FAST PROGRESS: The HCV/CV drill bit is easy to engrave; Sharp wood enables fast and efficient drilling progress without sinking into wood when drilling deep. MULTIPLE SIZES: The 7-piece set includes 4, 5, 6, 7, 8, 10 and 12 mm to meet different woodworking requirements. DURABLE SHARPENING: Drill bits sharpen woods are very durable and stay sharp for a long time even with intensive use to achieve precise and consistent results. EASY to use; USE: The wood drill bit fits perfectly into a regular drill to work on wood projects precisely and effortlessly.