7x1/4x5/8-11 Norton AZ24-R Depressed Center Grinding Wheel.
Norton 7" x 1/4" x 5/8-11 Threaded Arbor AZ24-R (combination Zirconia and Aluminum Oxide) Depressed Center Grinding Wheel for Grinding Welds and Metal. Premium grade wheel for superior performance and Extended Life( up to 5 times).