Specification：
Color: Gold
Outside Diameter: 100mm / 4 Inch
Inner Hole Diameter: 20mm/0.79 inch (without metal ring)
Inner Hole Diameter: 16mm/0.63 inch (with metal ring)
Thickness of Gear: 7mm(0.28 inch)
Weight:220g
Package Included：
1 x 4inch Diamond Grinding Cup Wheel
1 x metal ring
