90mm & 100mm Hole Opener Drill Bit for Marble, Granite, Tile

Summary

• Position at an oblique angle of 45 ° and drill in a vertical position (note that the speed cannot be too fast, and the speed should be slowly operated at about 800‑1000 rpm).
• The hole opener can be used on bench drills, hand drills and drilling machines but not on impact drills. (Cannot be opened with impact function).
• Suitable for all kinds of stone, ceramics, glass, glass, etc., keep adding water to cool down the holes.
• The hole opener adopts a segmented designed, which has a small cutting resistance and is conducive to chip removal.
• Universal triangular drill shank can effectively prevent skidding and bear more torsion.