Sait 58450 4-1/2" x 7/8" 50-Grit Premium Zirconium Fiber Discs 25pkSait 50-Grit Premium Zirconium Fiber Disc. Premium zirconium grain. Special zirconium grain to reduce heat build up and reduce loading. Closed coat structure for very aggressive material removal. Stainless steel, high tensile steel, titanium, aluminum. Ferrous metals. Tech Info: Resin over resin construction for a strong bond that is resistant to heat and moisture. Vulcanized fiber backing for heavy duty sanding. Available with SAIT-LOK quick change hub which extends disc life and requires fewer disc changes.
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