ORIGINAL valve spring compressor. Beware of fake, cheap, and low quality copies. We (EuroExportInc.) are the original creators and manufacturers of the tool. The copies contain cheap parts, especially bolts that are NOT long lasting/durable. Installing valve springs and/or retainers has never been easier. With the help of this tool, it only takes a matter of seconds to install the valves spring assembly in your vehicle. The body is anodized CNC machined 6061 T6 aluminum, for a gorgeous finish and excellent durability. The entire product is made from start to finish in the US. For use on Mazda Miata engines B6 1.6L years 1989-1993 and BP 1.8L 1994-2001. Simply place your valve spring and retainer in place, place the retainer cap on top of the retainer, and turn the long bolt to compress the springs until the valve keepers can be placed.