Bluefire® Type 27 Depressed Center Wheel, 4 1 2 in x 1 4 x 5 8 11, 24 Grit, Zirconia Alumina no checkout Exhale valve lets workers breathe Exhale valve lets workers breathe easy and stay cool Dura Mesh® shell resists collapsing in heat and humidity Molded nose bridge seals easily without a metal noseband Facepiece is naturally contoured for less pressure Straps are securely attached so they don’t break at the seal Lasts longer than standard thin cutting wheels Excellent performance to price ratio for lower total grinding costs Abrasive Material Zirconia Alumina Abrasive Trade Name BlueFire Anchor Brand Catalog NO Applicable Materials Steel