Sinclair introduces an advanced line of Planetary Grinders. "DiaLogic" is available in 3 models: 530 (21-inch), 680 (27-inch), 820 (32-inch). Designed for wet or dry grinding of marble, terrazzo, granite, concrete, the DiaLogic line is equipped with a vacuum system for dust-free operation. Applications range from rough grinding all the way to a polished finish.