Flap wheel, 1/4" shank mounted, featuring durable, high-grade aluminum oxide coating for aggressive cleaning and refinishing on most wood or metal surfaces. ideal for mounting on power drills or other chuck driven machines. carded. bulk version is forney 71688. wheel diameter: 2" (50.8mm) wheel height: 1" (25.4mm) grit: 60 max rpm: 25,000