This genuine Toro OEM anti-scalp deck wheel kit covers the trim side of the Toro Z-Master mower deck — the side closest to obstacles and edges. Anti-scalp wheels on the trim side prevent the deck from digging into raised spots when mowing close to beds, driveways, and curbs where the deck is most likely to make ground contact. Inspect regularly and replace when wheels are cracked, broken, or no longer rotating freely. Verify your model and serial number before ordering.