HIPA (Set of 5) Carburetor Tune-up Adjustment Tool for Most 2-Cycle Small Engine Outside diameter: 7/32 inch; Overall length: 6-1/8 inch.(metal pole: 3 inch. plastic handle: 3-1/8 inch) Built with squared handles, which makes it easy to tell 1/4 turn increments on the mixture settings. 1/4 turn is typically the increments you want when trying to tune a carburetor Used on most but not all engines. Walbro carburetor may need a 22-teeth splined tool Package include 5 tools: 21-Teeth Splined / Pac Man / Single D / Double D / Hexagon Socket