421-43084 Features: -Calcium stearate coating liquefies under heat keeping the material cooler and preventing loading with soft metals. -Premium blue fired AO grain with a polyester heat-treated backing. -Tool Shape: Type 27. -Arbor Diam: 7/8 in. Product Type: -Coated Abrasives/Grinding Wheels. Dimensions: Overall Product Weight: -4.4 Pounds.