This is Stihl's MS400CM Chainsaw that's ideal for felling, delimbing, and preparation of wood in medium-density stands. Long-life air filter system with HD2 filter for excellent filtering effect. Easy and reliable starting, M-Tronic for consistently high engine performance. Captive nuts on the sprocket cover. Tool-free fuel caps for easy and reliable refuelling. The first chainsaw with a magnesium piston for an excellent power-to-weight ratio.