HIPA (Set of 6 Carburetor Tune-up Adjustment Tool + Case for 2-Cycle Small Engine Including 21-Teeth & 7-Teeth Splined/Pac Man/Single D/Double D/Hexagon Socket Marked with tool type on the handle, easy to recognize 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 Tool carryng case help keep all the 6 tools organized in one place: 21-Teeth Splined / 7-Teeth Splined / Pac Man / Single D / Double D / Hexagon Socket