Usage: Wet or Dry Maximum speed 11,000RPM Diameter: 4" | Arbor Size:7/8"-5/8" Suitable for grinding machines and angle grinders Grinding Cup Wheel for Concrete Stone Granite Travertine. NON Thread. Description: Rpm:8000-11000 Core Thickness(mm):4.7mm Cutting:dry and wet cutting Outer Diameter(mm):100mm/4" Inner Diameter(mm):22mm/18mm Optimized bond and formula for longer life Optimized segment height minimizes dust and debris Surface finishing on concrete, screed and natural stone For your Safety: We recommends the use of following personal protective equipment: Eye protection Ear protection (ear sets) Hand protection (gloves) Lung protection (dust mask, also called respirator) Important Note: Ensure that no other person is at risk, especially near the machine while working. Never remove the protective machine guard and make sure it is properly adjusted to deflect debris away from you.