10 PCS Kit: 4" Diamond Double Row Cup Grinding Wheel Turbo Continuous Blade concrete stone toolsmart 6 Pieces of 4 3/8" (110mm) Diamond Turbo Continuous Blade for granite marble concrete. (inner hole diameter is 7/8"-5/8"). 4 Pieces of 4" Diamond cup wheel for concrete stone. (Non threaded. The inner hole diameter is 7/8"-5/8", since washer/bushing is included).