Compatible design This valve spring compressor tool is specifically designed for engines, compatible with both intake and exhaust valves of port cylinder heads. Material and durability Made of aluminum alloy, this valve spring compressor tool offers resistance to oxidation and rust. It delivers a long service life and helps reduce replacement costs. Easy to use The valve spring installation tool features simple operation. Just the rocker with the screw, insert a square screwdriver or socket wrench into the tool, and pry down the compression spring for quick and hassle installation. Professional design With its elegant design and craftsmanship, this valve spring compressor tool does not interfere with the overall performance of your vehicle. It can be easily installed using a wrench, providing professionalgrade results. Use scenarios Valve spring replacement on engines with port cylinder heads, for both intake and exhaust valves. Valve spring maintenance during engine rebuilds or refurbishments in shops. DIY engine service in a home garage for compatible engine layouts.