Bar's Bugs Grit Guard Bucket Insert is designed to be used within the 20 Liter Heavy Duty Bucket. You can also use it within other wash buckets of the same circumference. Grit Guards trap dirt and debris in the bottom of your bucket, helping to prevent you from reapplying dirt and scratching your car during cleaning. The insert features a raised radial surface. This extracts dirt, grit and grime from your wash mitt or sponge as you drag it across the grid. By keeping the contaminants at the bottom of the bucket, the Grit Guard Bucket Insert ensures that your wash water stays clean and free from abrasive particles. This simple and cost-effective solution provides a clean and scratch-free washing experience.