MK Diamond 169744 MK-303 7 by .030 by 1 inch - Continuous Rim is a lapidary blade. It is professional grade. The MK-303 Professional grade diamond blade has been designed for cutting rare and valuable materials when waste needs to be held to a minimum and speed of cut is essential. The MK-303 produces smoother cuts, lasts longer and cuts faster than notched rim or plated diamond blades. Designed for use with a water soluble coolant. Blades 16 inch and larger have segmented rims.