These Diamond Rippl Faceting laps have a textured surface which allows for more contact of the diamond surface since the debris is whisked away through the channels. The lap come with a standard pre attached aluminum master lap.Cut even faster than Channel laps. The 100 grit lap cuts like a 40 grit and the 180 cuts like a 60 grit lap. Fresh diamond continues to be exposed as the ripple sections of the lap wear down. If you want to remove material really fast, this is the lap for you. 1/2" Standard Hole size