MK Diamond 153742 MK-303 Professional 4-Inch Diameter Lapidary Blade by .014-Inch wide by 1/2-Inch Arbor 4 by .014 by 1/2 inch - Continuous Rim Lapidary blade Professional grade diamond blade Designed for cutting rare and valuable materials Produces smoother cuts, lasts longer and cuts faster than notched rim or plated diamond blades Professional grade lapidary diamond blade Used for cutting rare and valuable gem stone materials Continuous rim for ultra smooth cuts Professional design cuts faster and lasts longer