Silicon carbide and dual fiberglass reinforced. Used primarily on ceramic, masonry, plastic and other non-ferrous materials. Please enter your postal code to check availability. Silicon carbide and dual fiberglass reinforced. Used primarily on ceramic, masonry, plastic and other non-ferrous materials. Quality made to provide fast, safe and dependable service. Product Specifications: Wheel size: 4-1/2" (114.3 millimeters) Thickness: 1/4" (6.35 millimeters) Wheel type: Type 27 (depressed center) Arbor: 5/8"-11 Spec: C24S-BF Maximum revolutions per minute (RPM): 13,300 Tool type: Angle grinder