Practical Equipment - 4mm sprocket sewing tool, this needle plotting wheel has been carefully designed to ensure that it will not cut or puncture your leather and will work properly when in use. It ensures trace depth for edging process and improves edging efficiency What's the benefit Transfer pattern marks to fabric with or without tracing paper Ease of use -- the wooden cylindrical handle of our serrated milling wheel eases finger joints when rolling pressure. Not only is it easy to use, but it's also comfortable to hold. The gears are round to reduce friction while rolling and help save energy. MULTIPLE USES: Our hand sewing tools are suitable for leather, paper and fabric, suitable for making leather hemming industrial or hard leather, tracing, writing, hand sewing, hobby drawing, marking, pattern making and more. Specifications - These leather fabric sewing wheel tools are made of one piece of stainless steel and a wooden handle, precision engineered to ensure the wheel is stable during use, providing a straight and precise line every time, so the gears are not easily deformed Note - Stainless steel is not easily deformed or bent. This tool is a tweak, please use it sparingly and keep it away from children