Description Features: Quick release system presses straight against the retainer to eliminate side loading the valve and keepers Works on all motorcycle, ATV, UTV, and small engine cylinder heads Billet 6061 aluminum frame provides unmatched strength and stiffness and lower weight Fully adjustable top and bottom Aluminum lower adjuster will not damage or scratch valves Includes two universal fork style tips (18mm and 24mm or 24mm and 28mm outside diameter) Durable blue anodized finish with laser engraved markings Simple, fast, and easy to use 18mm & 28mm adapter set available separately