Product Description The IRWIN 5MM Diamond tipped drill bits are suitable for fast smooth cutting in all grades of hard and soft tiles. The raised diamond grit edge makes for easy starting in hard tile without the need for a guide and the tough brazed diamond is for fast cutting and long life. The reverse spiral forces water towards cutting head keeping diamonds cool to increase cutting speed and prolong life with the auto slug ejection slot allowing for continuous uninterrupted cutting. For fast smooth cutting in all grades of hard and soft tiles Raised diamond grit edge for easy starting. Tough brazed diamond for long life. Reverse spiral increases cutting speed. Auto slug ejection slot for continuous cutting.