Engineered for superior performance, these high-performance fiber discs from United Abrasives are designed to tackle the toughest materials, including stainless steel, aluminum, and high tensile steel. Measuring 5 inches in diameter with a 7/8-inch arbor, each disc features a premium zirconium grain with a grinding aid that significantly reduces heat build-up and minimizes loading during use. The closed coat structure ensures aggressive material removal while promoting longevity, making these discs an essential addition to any workshop. With a vulcanized fiber backing for heavy-duty sanding and bulk spindle packaging to keep each disc flat, these 36 grit discs are perfect for blending and grinding applications, capable of withstanding a maximum RPM of 12,200 for efficient operation.