The #520 Precision Adjustable Trammel is ideal for transferring measurements, scribing arcs and drawing large circles. It accurately measures and marks distances beyond the range of conventional compasses and dividers.
Included points can be replaced by pencils, ballpoint pens, crayons or soapstone sticks Fine adjusting screw for point setting Die-cast body and ground needlepoint legs Conforms to U.S. Government Specification GGG-T-661b
- Leg length: 3 in.
- Clamp opening accommodates 3/8 to 3/4 in. thick beam