Includes two 13 inches ungraduated beam bars and one coupling to accommodate circles up to 48 inches diameter. Spring-loaded thumbwheel on the top of each slide assembly allows for smooth and precise adjustments. Comes complete with interchangeable ruling pen, pencil, and divider legs. Includes spare leads and needlepoint. Packaged in a protective case with clear cover.
Alvin 961B Beam Compass - B000HEOI66