A whole MUST-TO-HCVE carburetor adjustment tool set, to keep engine with EPA specifications Comes with 21 Teeth Splined + 7 Teeth Splined + Single D + Small Head Single D + Double D + Pac Man + Small Head Pac Man + Hexagon + Shapde + Six Star. Convenient to use with every adjustment tool's handle stamped with the tip shape. 1/4 turn is the most used increments when tuning a carburetor.Easier to tell 1/4 turn increments on setting mixture ratio with square handles. Made of long lasting stainless steel, ergonomic grip and metal pole. With a carrying case to protect the tools, also to keep all the screw drivers from scattering around, easy to have all the 8 tools organized in one place.