Aluminum and Stainless Steel ¼” thick Product ID: 1155 - 4 ½” x ¼” x 7/8” Aluminum Disc 1156 - 7” x ¼” x 5/8-11 Aluminum Disc¼” Aluminum DiscDiameter/Arbor SizeSelectSpecifications Size Arbor size Rpm rating 4 ½” 7/8” 13,300 7” 5/8” threaded 8,500