Eco-Edge Granite Concrete and Stone Countertop Diamond Profile Hydrofloat Router The Eco-Edge transform electric & pneumatic polishers into a profile edging system.and granite. Adapters & hardware to run electric or pneumatic grinder with a 2" or less collar size is included. The Eco-Edge uses standard M10 router bits, no need to replace your bits with compatible products! This unit will fit many popular constant and variable speed grinders and wet polishers. polishing the edges of granite and stone up to 4cm.