Hitachi high-power motor (max. output of 1,010W) *Excellent overload durability *Compact and lightweight *Easy-to-use slide switch *Low operating noise *Prolonged service life of the carbon brushes Capacity Wheel Dia: 100mm(4″) Hole Dia: 16mm(5/8″) Spindle Thread M10 x 1.5 Power Input 800W o Load Speed 11,000/min. Overall Length 250mm(9-7/8″) Weight 1.6kg(3.5lbs.)