The Mercer 300100-25 is a Box of 25 4-Inch 100-Grit Aluminum Oxide Sanding Discs. Mercer products serve the Industrial, Contractor, Hardware, Welding, Auto, Flooring, and Woodworking Markets. With ISO 9001 certified manufacturing facilities in more than 10 countries, Mercer Abrasives has worldwide brand recognition, and their products are sold globally in North America, South America, Europe, and Asia. Mercer offers the best abrasives at the best prices to all trades - from drywall to flooring, construction, industrial, and automotive - look to Mercer Abrasives for its full line of superior quality and long-lasting abrasives, diamond blades, and laminate and industrial files. Features: * Heat-treated Aluminum Oxide grain * Vulcanized fibre backing * Resin on resin bond * Strong, long life * High stock removal What"s In the Box: * Mercer 300100-25 4-Inch 100-Grit Aluminum Oxide Sanding Disc 25-Pack