This tool can be used for tracing lines on paper, cardboard, foam, fabric, soft metals, and more. The versatile head can be locked for straight line work or loose to allow for circles or curved designs. It's the perfect perforated cutter for hobby, arts and crafts, sewing supplies and industrial uses. Use for tracing, pattern making, marking, quilting, sewing, wood working and other transferring applications. Details:Double sided7/16 in.14 teeth per inchInterchangeable wheelAluminum constructionHardened steel serrated tracing wheel is durable and strong