The Grunge Brush is the first brush that is specifically designed to clean motorcycle and ATV chains with one easy to use tool. The Grunge Brush can be used on O-ring and non O-ring chains with its rugged and durable construction. The Grunge Brush is oil resistant making it easy to clean your motorcycle and ATV chain without your brush getting slippery. The Grunge Brush features an innovative design which attacks greasy chains from 3 angles while keeping your fingers clean and safe. The Grunge Brush blocks are easily adjustable making it easy to clean any size motorcycle, ATV, or even bicycle chain. Replacement blocks are available as a set.