Diamond Flat Lap Disc,Diamond Faceting laps and Diamond Magnetic Backing Disk Useful life depends on the material you're cutting and individual cutting style,but under the same working conditions our laps can be expected to perform as long as or longer than any competitively priced products on the market.Our Flat Lap Disks is uality Electroplated Diamond Disks for Faceting machine and Flat Lap Machines.