297 filter holes, easy to filter, not afraid of clogging. Can effectively isolate sand and stone during the process of car washing, and keep the water quality clean. New environmental protection PP material, high impact resistance, strength and toughness, acid alkali resistance, anti-corrosion. The grit guard is a real paint-saver and has a number of other uses, too. Use it to clean paint brushes by running the bristles across the grid in a bucket of water or paint thinner, also use to clean automotive parts or drain your oil filter.