? Cloth File Belt,File Belts ? Use this BlueFire R823P medium grit cloth file belt for all light to moderate stock removal applications on metal and wood. Strong but moderately flexible, this belt features a waterproof x-weight polyester backing, a self-sharpening zirconia alumina abrasive and a durable resin bond combine for good grain retention and a belt life up to 30 percent longer than competitive zirconia belts. Ideal for light to moderate pressure tasks, this belt works well on dry or wet surfaces. ? Strong, self-sharpening zirconia alumina abrasive for fast, aggressive cut and 30% longer life than competitive zirconia belts ? Strong but moderately flexible, X-weight polyester waterproof backing excels on light- to moderate-pressure, dry or wet, applications ? Durable resin bond for excellent grain retention and product life ? Better choice for all medium grit metal and wood light to moderate stock removal applications ? 100-220 grit for intermediate to finish applications