ZVH1212 Features: * Adjustable trammels * Draw large circles and measure sizable distances with the accuracy of a divider * Fine adjusting screw sets points accurately * Points are removable and may be replaced with the pencil holder * Die-cast bodies with hardened and ground 3"" needlepoint legs * Clamp opening for beam is 0.36"" x 0.75"" * Conform to government specifications GGG-T-661b * Finest, most robust trammel package * Provided is a pencil holder which can be used in place of a scriber * Drawing large circles or for making marks over sizable distances Includes: * Set includes a fixed and an adjustable trammel, allowing you to dial in on your measurement with pinpoint accuracy