The 720D overlocker manufactured by Silver Viscount is a lightweight 3 or 4 thread overlocking machine with built-in tension adjusting device, differential feed and stitch length (1.1-4.0 mm) functions, automatic looper threader, built-in rolled hem and upper knife clutch device and a detachable extension plate for free arm sewing. It has a variable stitch width of 2.3 - 7.0mm and an automatic safety switch which is activated when the looper cover is opened. Threading the Silver 720d overlock machine is simplified by color-coded thread guides and a self-threading lower looper. Simply lay the thread into the guide, flip a switch, and the lower looper is threaded. The guide is automatically returned to its normal position when you turn the balance wheel. The 720D is a very versitile overlocker that can stitch at great speeds of up to 1300 stm.