3 inch copper hybrid bond polishing puck suitable for concrete, terrazzo, quartz, granite, and marble polishing. 0.4"/10 mm working thickness for medium to heavy grinders with more than >15 lbs of grinding pressure per polishing pad, overall product thickness 15mm. It is the balance of cost and durability for medium to large projects Wet/Dry copper polishing pad designed to achieve the ultimate shine and longevity. Wet polishing can avoid overheat and will haver longer working life. Copper hybrid bond polishing pad effective at removing scratches left by metal bonds, last longer and work more aggressive than resin bonds Pack of 3 pcs Made of premium quality copper and professional grade diamond powder. Hook & Loop Backing, 3mm EVA cushion reduce vibration and better for uneven floors. 3 inch resin bond polishing pad also available in Actintool store 3 inch copper bond floor polishing pad fit with floor grinding machine for the polishing of concrete, terrazzo floor