21 x 21 Mesh: Has larger holes than other open mesh products. This feature prevents “loading” and allows contractors to rinse the mesh clean. Resists clogging even when used on softer materials;Premium blended 165 grit white Aluminum Oxide cuts and scores surfaces faster for more effective cleaning and deburring. Traditional open mesh plumbers' rolls typically use less aggressive grit material;Waterproof: Wet conditions have absolutely no adverse effect on the performance or durability of Blue Monster open mesh;2" Width: 33% wider than traditional 1-1/2" wide plumbers’ rolls. Blue Monster provides contractors with more "surface-to-surface" coverage;Bright Blue color: Bright color makes it easy to find in dark or low-light work spaces;Perfect for pipe diameter 2" and larger.