Diamond Channel Laps have a textured surface which allows for more contact of the diamond surface since the debris is whisked away through the channels. For Faster, Cleaner Cutting. A premium metal bonded diamond lap with island type plateaus separated by channel depressions.The lap come with a standard pre attached aluminum master lap.Can be used for general cutting purposes. They are similar to Regular laps except that the surface of the lap has randomly spaced channels surrounding diamond impregnated "islands." The channel depressions allow cutting debris to be quickly flushed away. The result is quick cutting action. 1/2" Standard Hole size