Norton Surface Grinding Segment, Type 31, Series: 5SG, 11-1/4 in Width, 6 in Height, 2-1/4 in Thickness, 30 Grit, Ceramic Alumina Abrasive, E Hardness Grade, Vitrified Bond, ME30777 Blueprint Number, Applicable Materials: 300/400 Series Stainless, Cast Iron, Ductile Iron, Gray Iron, Hard Carbon Steel, Super Alloys, Tile, Titanium and Tool Steel, For Chuck Type: Cortland, Porous Porosity