Type 1 Aluminum Oxide Straight Grinding Wheel, 7 in, 1 in Arbor Hole Size, 36 Grit/ OVERALL THICKNESS: 1.000 INCHES NOMINAL SCREEN GRIT SIZE DESIGNATOR: 36 USAGE DESIGN: METALWORKING MAXIMUM SPEED RATING IN RPM: 3600.0 MOUNTING METHOD: WHEEL DIAMETER: 7.000 INCHES NOMINAL WHEEL STYLE: 8 STRAIGHT SPECIAL FEATURES: GENERAL PURPOSE; INCLUDES 1/2, 3/4 AND 5/8 IN. BUSHINGS SPECIFICATION/STANDARD DATA: 5047-ASME B74.2 AND B74.13 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE