FOR HIGH EFFICIENCY, IT CONTAINS DOUBLE SIDED INTERCHANGEABLE DIAMOND PLATES OF 220# GRIT FOR COARSE GRINDING AND 360# GRIT FOR FINE FINISHING OF STONES SURFACE. FOR HIGH ACCURACY, ITS TOP IS EQUIPPED WITH A SPIRIT LEVEL, SO THE UN-EVEN SURFACE DETECTION AND THEN CORRECTION CAN BE ACCOMPLISHED PRECISELY IN ONE STEP.
eBay