The STIHL multi-function tool comes in models for homeowners and professionals, allowing for adjustments to STIHL chainsaws as well as other STIHL tools and components, such as trimmers, gearboxes and more. Both tools include a T27 Torx driver for most Torx screws on a STIHL powerhead, a small tool/screwdriver for cleaning out the guide bar groove or adjusting carburetors, a large screw driver for adjusting chain tension, an 8mm wrench for loosening nuts found on STIHL powerheads, a 19mm socket for spark plugs or large guide bar nuts, and a small Phillips head screwdriver.Find the MULTI-PUR TOOL 19-16 at Ace.