This set of solid aluminum arc templates, can be used for marking, cutting, and pattern making. They’re thick enough to use as cutting templates directly on your leather piece, and aren’t so thick to interfere with your knife. Because of their clever design, they take up far less space than full size circle templates. This is especially nice in a small shop where space is a premium.
Included in the set:
Four nesting double-arc aluminum tools. Each are precision cut from 1/8” thick solid 6061 aluminum. The set features eight unique curves and rounded tips which can also be used for drawing and cutting.
Made in USA.
Here's a great video from one of the creators that explains just why you need this and how to use it.