Traps dirt at the bottom of the wash buckets, preventing abrasive particles being dragged across the vehicles surfaces while washing. Baffle system prevents dirt particles from churned up once trapped. Fits standard round 20, 25 and 30 L plastic wash buckets. Bucket not included. Meguiar’s Grit Guard wash bucket insert provides an additional level of protection against swirls and scratches when washing your car. Grit Guard prevent the dirt and abrasive particles that have been removed during washing from being reapplied to the car each time your wash mitt or sponge is dipped into the wash bucket.