158690 Cup Wheel Size: 4" Features: -Wet/Dry Turbo Cup Wheels MK-504CG-2 Double Row. -Supreme grade for stone and concrete. Specifications: -Item # 158690 - Diameter: 4", Segments: 14, Weight: 1 lbs. -Item # 158732 - Diameter: 5", Segments: 16, Weight: 1.26 lbs. -Item # 158736 - Diameter: 7", Segments: 24, Weight: 2.29 lbs. -Arbor: 7/8"-5/8".