C-type Valve Spring Compressor works one-handed to help you easily replace valves, springs, seals, guides and more. Valve spring compressor is a one-handed tool, meaning you can both lift and release the spring with one hand, leaving your other hand free to handle the valve spring keepers. Ratchet locks automatically at any position. Works with most cars, lighter trucks and motorcycles. Includes 2 sets of jaws: one straight and one offset. Made in USA.