Grit Guard bucket InsertReduce swirl marks, easily and effectively. Traps dirt at the bottom of bucket Grid surface scrapes dirt out of mitt or sponge Cleans mitts, brushes, towels and other washing utensils Protects painted surfaces from being scratched. Grit guard diameter 26. 5cm How it Works The Grit Guard Insert is a raised radial surface that fits into the bottom of a bucket (26,5 cm diameter). The Grit Guard Insert extracts grit and dirt from your wash mitt, sponge,