STIHL KM55 Powerhead Only. 27.2cc Combi Engine. Cowhorn Handle. Available as a Standard or ErgoStart Model. These Units are Designed with the Cow Horn (or Bike Type Handle) Configuration so Make Them Suitable for Use With the Following Combi Accessories:- AC-KM AutoCut Mowing Head, MB-KM Grass Blade BrushCutter, BF-KM Pick Tine Cultivator, FH-KM 135Degree Scrub Cutter. The ErgoStart Option Allows for Much Easier Starting Making This Tool a Real Pleasure to Use and Own.