Rocflugilo 4 inch diamond grinding cup wheel Turbo Row Size: 4"x.290"x.690" Arbor: 7/8" Not threaded Segment height: .690" Thickness: .290"(7mm) Application: Concrete, Masonry, Granite, Marble, Stone and Building Material Applicable models: 4" or 4.5" angle grinders with a 5/8" or 7/8" arbor Warm Notes Please wear the personal protective equipment when start grinding. Do not install a diamond cup wheel that is too loose or too tight on the flange. Be sure to hold the grinding wheels properly to prevent slipping, but do not use excessive force. Never use a hammer. Before installing the grinding wheel, please replace the deformed or damaged flange. Warm Notes Please wear the personal protective equipment when start grinding. Do not install a diamond cup wheel that is too loose or too tight on the flange. Be sure to hold the grinding wheels properly to prevent slipping, but do not use excessive force. Never use a hammer. Before installing the grinding wheel, please replace the deformed or damaged flange.