Item: SHDIATOOL Hexagonal PCD Grinding Cup Wheel Quantity: 1pc Specification: Diameter: 4.5"/115MM; 5"/125MM; Bore: 22.23mm, with a washer(15.875mm) Application: Remove epoxy coatings, waterproof membranes, adhesives, thick adhesives, and paints from floors, etc. Feature: 1. 6pcs PCD segments provide efficient and long-life operation; 2. High quality steel core and 100% balance inspection to avoid shaking; 3. More wear and heat resistant than ordinary grinding wheels, longer working life. Attention: 1. Do not grind metal materials. 2.115mm: Recommended RPM 8000; Max RPM:13200. 125mm: Recommended RPM 7000; Max RPM:12000.