Features: Diameter: 4-1/2″ (115mm); Arbor size: 7/8″(22.23mm) with 3/4″ reducer ring , Non-Threaded; Cooling Vent Holes: 8 ; Teeth: 30 ; Max Speed: 13,200 RPM ; Rim Width: 7/8″ ; For WET/DRY Turbo ; Include: 2PCS