Check the listing for details. Diamond Grinding Wheel 3 ½” x ½”, New/Other.. Condition: New – Open box. Listed at 30.00 USD. Diamond Grinding Wheel 3 ½” x ½”, New/Other: This is a 3 ½” Diamond Wheel, product # E0528623-1. It is a New/Other surplus wheel that is unused in its original box. The box is dirty, taped and missing its label. Other numbers on the wheel are Size 133949-003N and 030116. The box also has the hand written number 92-699-9015 and 10370 RPM. This wheel measures 3 ½” x ½” with a 1 7/8” arbor hole and a 4 threaded hole recessed mounting. The recess is ¼” deep and the 4 threaded bolt hole form a square and are 1 5/8” apart. The sintered diamond face measures ¼” wide and 1/16” thick. The diamond appears to be a medium grit, but the box isn’t marked and we have not been able to find any more information. For more eBay items visit: Kent's Tools 4 You eBay Store