Genuine Stihl Autocut 46-2 StrimmerTrimmer Bump Feed Head, this head replaces  Stihl Autocut 40-2 which is now obsolete. The Genuine Stihl Autocut 46-2 has a double line for mowing and thinning out work. Mowing line is advanced automatically by tapping the cutting head whilst it is rotating (Tap N Go)It is fitted with 2.7mm line.