This set of adjustment tools is "must" for most small 2 cycle 50 hour rated carburetor. It is designed for qualified technicians to adjust the carburetor. Carburetors that cannot be used in road vehicles are not suitable for car carburetor. It is very useful for your daily use, saving you time and making your work easier. Features: 1. This set of adjustment tools is required for most small 2 cycle 50 hour carburetor. 2. There are 10 carburetor tools, including pac man tools, double D tools and spline tools, which are an alternative adjustment tool for many brands of equipment. 3. The handle is marked with the type of tool, easy to identify, with the anti-slip handle design of the finger rut, safe operation. 4. The tool uses a plastic handle, metal rod, light weight and easy to carry. 5. It is designed for qualified technicians to adjust the carburetor. 6. Suitable for Stihl Husqvarna Zama Walbro chain saw of the Carburetor, trimmer, lawn mower, brush . Tip: These tools CAN Not be used on carburetor of street vehicles and Will Not fit an automobile carburetor. They are to be used to adjust within EPA regulations. Specification: Screwdriver Length: 11.8cm / 4.65 inch (appr.) Handle length: 8cm / 3.15 inch (appr.) Package List: 10 x Adjustment screwdriver (type is picture) + 1 x storage box .