Includes: (1) Blue Grit Guard Insert and (1) Black Grit Guard Washboard. The Grit Guard Insert (Blue) is The Original Grit Guard bucket filter insert that fits 12-inch diameter buckets to keep dirt particles, grime, and particulates off your sponge, wash mitt, or brush while washing. Designed with a raised radial surface that fits in the bottom of most 3, 4, 5, 6, and 7-gallon buckets. Works to extract grit from your wash mitt or sponge when dragged across the Grit Guard surface. The dirt then settles on the bottom of the bucket, away from your wash mitt or sponge, keeping your water clean. Dimensions: 2-1/2" x 10-3/8". The Grit Guard Washboard (Black) works in conjunction with the Grit Guard Insert to separate grit from your wash mitt. The Grit Guard Washboard has no flat surfaces for dirt and grit to collect, and like the Grit Guard Insert extracts contaminants from your cleaning tools. Rub your cleaning tool in a downward stoke against the Washboard to extract and clean your long-handled brushes, wash mitts, and sponges. All harmful contaminants settle at the bottom of the bucket.