This aluminum channel beam compass, with graduations in both inches and millimeters, includes two 13-inch beam bars and one coupling.
The maximum arc/ diameter that can be drawn with this compass is 51.5 inches (140.97cm).
This specialized compass can be used to transcribe large circles/arcs, transfer measurements on large charts, or technical drawings for wood or metalwork projects.
A molded storage tray holds all the components in place when not in use.
A 13-inch (33.02cm) Extension Bar (545330) enables the user to extend the reach of the compass to a 64-inch (162.56cm) radius when using all extension bars. (Available separately.)
Box - 16 5/8" x 4 3/4"/419.1 x 120.65 mm