3M™ Cubitron™ II 66587 Depressed Center Grinding Wheel T27 4-1/2" x 1/4" x 7/8" (20/Case)3M™ Cubitron™ II 78466 Depressed Center Grinding Wheel T27 4-1/2" x 1/4" x 7/8" (20/Case)3M™ Cubitron™ II 66587 Depressed Center Grinding Wheel T27 4-1/2" x 1/4" x 7/8" (20/Case)