1. This adjustment tool set is required for most small 2-cycle 50-hour carburetors. 2. There are 10 carburetor tools, including pac man tools, double D tools, and splined tools, which are an alternative adjustment tool for many brands of equipment. 3. The handle is marked with the tool type, easy to identify, with the non-slip finger rut handle design, safe operation. 4. The tool uses a plastic handle, a metal shaft, light weight and easy to carry. 5. It is designed for qualified technicians to adjust the carburetor. 6. Suitable for Stihl Husqvarna Zama Walbro carburetor chainsaw, trimmer, lawn mower, brush cutter. Tip: These tools cannot be used on street vehicle carburetors and are not suitable for automotive carburetors. They must be used to comply with EPA regulations. Specification: Screwdriver Length: 11.8cm / 4.65inch (Approx.) Handle Length: 8cm / 3.15inch (Approx.) Package List: 10 x Adjustment Screwdrivers (Type as shown) + 1 x Storage Box