Firepower Aluminum Oxide 0.25 in 24 Grit Grinding Wheel Wall Mounted Hooks Greenguard Gold Warranty Lifetime Residential Greenguard Gold Warranty Lifetime Residential Q: What is the Janka hardness rating of this bamboo flooring 25 Arbor Diameter 7 8 in Threads Per Inch 7 For Use with Concrete & Masonry No For Use with Aluminum Yes For Use with Tile No For Use with Stainless Steel Yes For Use with Ductile Pipe No For Use with Asphalt No For Use with Ferrous Metal Yes Package Quantity 1 Warranty None CA Residents: Prop 65 Warning(s) No For Use with Chop Saws Yes For Use with Cut Off Saws Yes For Use with Angle Grinders No For Use with Circular Saws Yes Sub Brand N A Series Name N A Application Grinding Material Aluminum oxide Type Type 27 Wheel Type Grinding wheel Grit 24 Diameter (Inches) 0