Must have for 2 Cycle engines to keep them in good performance: Fits for ZAMA, STHIL, Husqvarna, Poulan, Weedeater, Echo, Homelite, Ryobi, MTD, Troy-Bilt,Toro, Sears, Ruixing, Huayi; string trimmer, chainsaw, leaf blower, hedge trimmer, edger, pole pruner and anything else that utilizes the carburetor adjustment tool. Squared handles, which makes it easy to tell 1/4 turn increments on the mixture settings when trying to tune a carburetor; Advanced heat treatment process and corrosion-resistant finish screwdriver bits Cleaning kit include: 1pc hex wrench + 6pcs cleaning needle + 6pcs cleaning brush which can be used to clean carburetor and fuel lines. You will get: 12pcs carberator adjustment tool, 1 carburetor cleaning kit, 1 tool carrying case 100% Satisfaction Guarantee, 90 days return, refund or free exchange if you aren't completely satisfied (defection, accidental damage, non-satisfaction etc.) Any problem please do not hesitate to contact us. Save yourself the hassle of returns and exchanges by double-checking your engine's model number and part number before ordering any parts.