Sold as 4 UNITS at $6.58 per unit. (1 unit = each.) 1 inch. Includes 2 fine abrasive wheels. For use with the EZ402 chuck or standard 402 chuck. Ideal for removing tarnish from brass or for use on metal, glass, wood, aluminum and plastics. Compatible with all Dremel rotary tools Manufacturer number: 512E. SKU #: 2182806. Country of origin: Germany. Distributed by Dremel Mfg Co.