1.[10-item set] This carburetor adjustment tool kit includes 10 items: 21-tooth spline screwdriver + 7-tooth spline screwdriver + single-D small-bit screwdriver + single-D small-bit screwdriver +a double-D screwdriver + a Pac-Man screwdriver + a Pac-Man small-bit screwdriver + a hex screwdriver + a slotted screwdriver + a six-point (star) screwdriver.offers more carburetor adjustment tools than any other brand. 2.[COMPATIBLE WITH the vast majority of 2-stroke engines]: compatible with chainsaws, equipment from many brands such as, any other equipment using splined adjustment screws. 3.[Excellent quality and carrying case] - Bits made of very robust stainless steel, ergonomic handle and extremely durable metal rod. 4.Delivered with an elegant carrying case to protect them and store and organize these 10 tools with ease.Cleaning needles and brushes included, to help clear obstructions that may occur in the very narrow parts of your engine's carburetor。 5. This carburetor adjustment tool kit will be an essential ally for working on 2-stroke engines of everyday appliances.Adjusting their carburetor will allow you to increase or reduce the engine idle speed and allow the carburetor to mix an optimal amount of fuel and air, and thus increase the performance of your engine by adjusting it accordingly.