Phenolic Resin Bond diamond tools are the best polishing tools on the planet! Super long life because they are 8mm thick and created with the contractor in mind. Quickly take your polished concrete projects to their highest possible gloss and lowest possible Ra readings in the industry! These tools are to be used ONLY DRY! Never use water with Phenolic Resin Bond diamond tools or they will smear and wear excessively fast. This is the perfect diamond tool for polishing with the Sika™ polishing system!