From the Manufacturer
This disc grinder has an all ball and needle bearings for long tool life; a high power-to-weight ratio for superior performance. Its spindle lock permits easy wheel changes; a standard 5/8-inch-11 UNC spindle for use with a wide variety of accessories. A removable side handle can be mounted on either side of tool for operator convenience. This grinder is double insulated and also has an AC/DC Switch for use on alternative power source.
Product Description
4-1/2" Mini Grinder, 5.5 Amp, AC/DC