Thank you for viewing. Clover Double Roulette Draws seam allowance and cutting lines simultaneously! Total length: approximately 14.5cm Round teeth Two lines can be drawn simultaneously, and the tooth spacing can be adjusted in 5mm increments from 10 to 30mm. When transferring a pattern to fabric, you can draw the "sewing line" and the "cutting line" at the same time. I purchased this quite a while ago, but it's unused. I have stored it in a drawer at home. I think it's a convenient item for those who sew. For those who understand home storage and used items. No pets, no smokers.