Taytools 468310 Large Adjustable Trammel Head Set Beam Compass, Pencil Holders, Hardened Points

These adjustable clamps on trammel heads are the perfect tool for measuring, marking or writing circles or arcs outside the range of those that could be made with a standard compass. Unlimited bows can be made with your custom beam. Heads clamp to any wooden beam from 1/2" to 1 5/8" wide Set comes with two trammel heads. Both tips can be removed and are suitable for standard wooden pencils Heads are made of durable cast zinc Tips are sharply ground and hardened to allow scribing on steel, sheet metal or aluminum