The heads feature radius set points cast in alignment with marking pointers for easy setting. Each is equipped with 1/4" screws and squared on the back side for perpendicular alignment.
The stationary head holds a 1/4" case hardened centre point. The moveable head has a 1/8" steel scribe hardened to 59 Rockwell.
The chalk holder will accept round, square or flat soapstone crayon, pencil or steel point scribe.
Marks from 1-1/2" circle to any diameter needed, depending on length of pipe used as a trammel bar. You can attach several lengths of pipe or conduits together to form very large arcs.
Heads are made from durable aluminium. Each set weighs approximately 8 oz.
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