ITEM NAME:Spline Shaped Carburetor Tool Screwdriver For STIHL Husqvarna Poulan carbur A3Z5 Spline Shaped Carburetor Tool Screwdriver For STIHL Husqvarna Poulan carbur A3Z5 Homelite.For STIHL Husqvarna Poulan carburetor. Item included:1 x Splined Screwdriver. Shape: 7 tooth Splined shaped. These adjusting tools are a "must" to keep these 50 hour rated, small, 2 cycle machine running.