Taytools 468303 Compact Adjustable Trammel Head Set Beam Compass, Pencil Holders, Hardened Points

These adjustable clamp on trammel heads are the perfect tool to measure, mark or scribe circles or arcs outside the range of those that could be produced with a standard compass. Unlimited arcs can be made using your custom-length shop-made beam. Heads will clamp onto any wood beam from 3/8 inch to 1-1/4 inch wide Set comes with two trammel heads, one has an integrated pencil holder that will accept standard wooden pencils. Comes with extra set of points. Heads are made from tough cast iron The points are ground sharp and hardened to allow scribing on steel, sheet metal or aluminum, Manufacturer: Taylor Toolworks