Comply with ANSI B7.1 regulations.Maximum RPM 25,000. Norton 66243522381 2-1/2x1/2x3/8 In. Gemini 57A AO Reinforced Portable Snagging Wheels, Type 01, 24 Grit, 20 pack. Fast shipping on Norton grinding wheels and welding supplies from Quality aluminum oxide for consistent performance at an economical price u2022 Designed for portable cut-off tool and power drill applications Eco Edge 3-Pack 4-Inch Cut Off Wheel: Aluminum Oxide Double Reinforced Cutting Disc Size 4 X0 040 3 8 Arbor Die Grinder Ultra Thin Superior Cutting Wheels NOR69078609034 - Norton® 20 X 3/16 X 1 Gemini® Extra Coarse... 045 in ARBOR: 7/8 in ABRASIVE SPECIFICATION: AL46N-BF ABRASIVE GRAIN TYPE: AL (aluminum oxide) GRIT: 46 (medium) BOND HARDNESS: N (soft for faster cutting or grinding) TYPE OF BOND: BF (resinoid fiberglass reinforced) MAXIMUM REVOLUTIONS PER MINUTE (RPM): 13,580 TOOL TYPE: Right Angle Grinder