Struggle with installing those pesky piston rings when rebuilding your engine? Easily compress the piston rings with the Tusk Piston Ring Compressor. Built to assist with piston installation, the Tusk Piston Ring Compressor includes 5 different ring sizes to cover piston diameters from 40mm up to 100mm. This tool is packaged in a custom box to ensure all the pieces stay together while you break-in your newly rebuilt motor. For high-quality tools, look no further than Tusk Offroad