The blade is 1 1/4" in diameter and .035" thick. It is used for cutting wood & plastic. Can be used up to 8,000 RPM. For use with Dremel or other high speed rotary tools. Available with or without heavy duty 1/8" mandrel, please specify above under product options. Always wear protection and use extreme caution when using any of our saws. For use with heavy duty 1/8" shank mandrel (item #420-4).