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 O(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. molded storage tray holds all the components in place when not in use.
Weems & Plath Item #: 545E
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