Fits 60cc through 500cc dirt 2 Strokes. Enough to mount your Two Stroke cylinder and head on most any model. (KX500 needs 2 more cap nuts on request) Comes with 7 Chrome M8 Tall Acorn Flange Nuts. More that enough for most 2 stroke Dirt Bike or ATV engines. You get 7 Matched 1.5mm thick M8 copper sealing washers. Can be used for "O" ring or head gasket applications. This kit gives you both M8 & M10 Base Flange Nuts. Class 10 nuts will not strip or round off! 2 M6 Drain bolts in this kit along with reusable copper drain washers. This universal kit is designed to save big money on purchasing cylinder bolts individually. This kit is an upgrade over OEM. No expense was spared in these high quality aftermarket top end nut kits. KX500 engine that uses a 9 head nuts! If you have engine give us a call and well sort it out no charge.