Divider Screw Compass Measuring Even Spacing Fixing Cutting Leathercraft Total Length: 15cm Measurable Distance (Drafting Radius): 1mm～120mm When doing leathercraft or model making, it's convenient for drawing neat straight lines and circles on leather or metal plates, and for decorative edge lines, diamond stitching, and hand sewing. This is a guideline drawing tool for hand sewing. You can draw a stitching line (guideline) at a constant width from the edge of the leather. Because it's a screw type, fine width adjustments are possible. Also, the width won't change when drawing lines. Notes: Because it's sharp, please handle with care. Also, if you don't use it often, please apply rust-preventative oil. There may be some oil stains and a deviation of about 1mm. Please purchase only if you understand this.