The MTD 911-04020 Spindle Blade 1/Pi helps support the mower blade and maintain proper cutting performance during operation. Designed as part of the mower deck spindle system, this component works with the spindle assembly to keep the blade securely positioned and rotating as intended. It is a suitable replacement for a worn or damaged spindle component that may cause blade vibration,... https://www.wholetoolbox.com/mtd-911-04020-spindle-blade-1-pi/911-04020.html