Poly-cotton heat treated backing. Recommended for aggressive use and heavy duty applications. Special optimized resin bond offers maximum cutting capacity strong edge stability and long life. Active grinding agent provides cool cutting with light pressure. Excellent on carbon and stainless steel. 10 per Box. Diameter: 4 1/2 . Tool Shape: Type 29. Arbor Thread - TPI or Pitch: 5/8 - 11. Grit: 40. Speed: 13300 rpm. Abrasive Material: Zirconia Aluminum. Applications: Deburring Rust Removal Deflashing Snagging. Applicable Materials: Ferrous and Non-Ferrous Metals Stainless Steel High Tensile Alloys Woods Plastics. Used With: Right Angle Grinder/Sander. Type: Type 29 with Hub.- SKU: ORSNO63433