Engineered with precision, Stens spindle assemblies maximize lawn mower power while enhancing the efficiency of the pulley system performance. Stens spindle assemblies rotate blades with a consistent and smooth motion for a perfectly even cut. Solidly build to handle the rigors of lawn care, these spindle assemblies resist damage from hazards commonly encountered outdoors. Improved resistance to damage means these spindle assemblies keep working at optimal performance standards over a longer service life. Spindle assemblies come completely built and ready for installation, which saves the labor of refurbishing an older one.