The Simplicity 1729137SM Chipper Shredder J-Hammer helps deliver efficient shredding performance for compatible chipper shredders. It works by swinging freely on the rotor to break down leaves, twigs, and yard debris into smaller pieces for easier disposal or composting. Made to replace a worn, cracked, or damaged J-hammer, it helps restore effective shredding action, improve material... https://www.wholetoolbox.com/simplicity-1729137sm-chipper-shredder-j-hammer/1729137SM.html