Firepower Grinding Wheels Aluminum Oxide 24-Grit Grinding WheelDesigned for use on air or electric powered right angle or vertical shaft grinders Includes hub Weight : 0. 45 lb 4 1 2 in. x 1 4 in. x 5 8 in. to 11NC depressed center grinding wheels, type 27 Features Sub Brand N A Series Name Grinding Wheels Application Grinding and cutting Material Aluminum oxide Type Type 27 Wheel Type Grinding wheel Grit 24 Diameter (Inches) 0 Thickness (Inches) 0. 25 Arbor Diameter N A Threads Per Inch 4 For Use with Concrete &