Professional tool for commercial or occasional use Zirconium flap discs 80 grit zirconium flap discs This listing is for a pack of 20 zirconium flap discs Perfect for removing rust, grinding of welds, parting lines on casting and carbon steels or removing rough edges on most surfaces The high grin adhesion is for a long life which outlasts conventional sanding discs With these flap discs there is no backing disc required Fits directly onto an angle grinder Suitable for use with a 4-1/2" (115mm) angle grinder with a 14mm thread Zirconium discs are a lot longer lasting than normal discs Goggles should always be worn when using this toolSPECIFICATIONS 80 GRIT Zirconium flap disc 115mm x 22.2mm / 4-1/2" x 7/8" Max speed 13,000 RPM Quantity - 20pc (individual discs)