This multi shaped tool is extremely versatile and can be used with any style of machine. It is available in three sizes: small, medium, and large. For reference, the circle shape on the large "June" is 2", medium is 1 1/2", and small 1". Attach a gripping aid to the bottom for more stability. For ideas on how to use the June ruler, check out the following link. June Ruler Tuturial
