Trammel Points PRECISION ADJUSTABLE TRAMMELS Clamp opening for beam is 3/8 x 3/4. 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 inches needlepoint legs. Includes package of 12 Replacement Points.