The Clamshells ruler has a multitude of uses! With 2 sizes available in the one ruler you can create clamshells that are 4″ as well as 2″ in diameter. These have been recently redesigned to include accurate etched guidelines to assist you in repeating perfectly! Available in both 6mm & 3mm thick to be used on either longarm or domestic machines with low shank ruler foot. High shank machines can use the 6mm thick ruler.
Use them as a frame in a border for floral designs or together to create a doubled clamshell design