This high-quality tool helps ensure your engine runs better by deglazing the cylinder walls keeping them smooth to hold oil as designed. The Powerbuilt adjustable cylinder hone deglazer is the perfect tool to deglaze cylinder walls from 2 inches up to 7 inches in diameter. Three 4 inch #220 grit stones are held against the cylinder walls by an adjustable spring and flexible shaft. Simply turn the knurled wheel to set spring tension to get the right pressure on the cylinder wall to remove the glaze and spin the tool within the cylinder. Restore the performance of your engine with this tool like a pro.