3M Flexible Diamond Roll 6456J, 8in x 8ft x 3in, M74 Micron, Type FB, Pattern 18General Information Brand 3M Country Of Origin United States Sold As Roll California Residents Proposition 65 Warning Return Policy NCNR Non Cancellable Non Returnable Dimensions and Specifications Core Size (Imperial) 3 in Core Size (Metric) 76. 2 mm Micron Grade M74 Overall Length (Imperial) 8 ft Overall Length (Metric) 2. 4384 m Overall Width (Imperial) 8 in Overall Width (Metric) 203. 2 mm Backing Weight Non Pertinent Grit Non Pertinent Volume