General Tools Compasses Precision Pencil Compass - 842

General Tools Compasses General's adjustable trammels accurately measure and mark distances that are too great for conventional compasses and dividers. Trammels will accurately transfer measurements, scribe arcs and lay out circles. Points can be replaced with pencils, ballpoint pens, crayons or soap- stone sticks for marking various materials. Product Features Carpenter quality compass is made of long lasting die cast, rust resistant metal. Spring tension adjustment for marking up to 8" diameters. Scribe guide for edge marking. For use with pencil (included) or slim ballpoint pen.