1 premium professional measuring compass for math, geometry, art, drawing and drawing. Also used as an angle measuring tool for jewelry making. Needle tips are used as a separator. Smooth adjustment of the central wheel. Measure the exterior and interior dimensions and measure the distance between points. This caliper has a strong yet flexible arc spring, which gives a smooth and precise action. Necessary tool for craftsmen, architects, carpenters, etc. Completely made of metal, made of premium stainless steel, solid and high strength. Lifetime Satisfaction Guarantee Commonly used in leatherworking, woodworking, engineering, decoration, or craftsmen, architects, carpenters, etc. Product Features: 1. Made of premium stainless steel, solid and high strength. 2. It is used as an angle measuring tool for jewelry making. 3. Needle tips are used as a separator. 4. Smooth adjustment of the central wheel. 5. Necessary tool for craftsmen, architects, carpenters, etc. Features: Condition: new. Material: stainless steel . Color: as shown in the picture. Size: length about 149mm, opening diameter about 110mm Quantity sold : 1 piece Tips for use It is used when you need to draw a line in the cut diamond on the leather. Use a ruler to measure the required distance and lock it.After pressing a straight line on the leather, you can use the diamond chop to punch the hole, and it can also be used to draw the decorative line of the edge of the leather. Problem reference when using: 1. The upper screw is movable and may be loosened during transportation. You can tighten or loosen it yourself. 2. Different players have different requirements for the sharpness of sharp parts. If you need to polish it sharper or rounder, you can use sharpening stone, sharpening paste, sandpaper, etc. to handle it yourself. This product is only suitable for use on hard leather and vegetable tanning. The use of DIY spacing planning wire gauge is not limited to the above , and the suggested use is for reference only! About chromatic aberration: The goods sold are all taken in kind, but due to different lighting, monitors, etc., there will be a little color difference, which is a normal phenomenon, not a quality problem! About size: The dimensions of the products sold are all measured manually. Due to different measurement methods and tools, there may be an error of 1-2mm, which is normal!