As an alternative to the Compass Rule, Alumicolor™ also offers Compass Point Kits for use with your existing ruler or yardstick. Compass Point Kits include the anchor point, lead holder and lead for drawing circles, and a rotary knife for cutting circles. Compass Point Kits also fit Alumicolor's™ rulers and yardsticks. The straight edge size fits 6" to 24" rulers. The yard stick size fits 30" to 48" rulers.