Powerful and durable motor with an input of 715W (max. output 870W) *Well balanced and ergonomic design for easy operation *Hitachi original dust proof construction for long service life against abrasion from dust: Application of adhesive to the commutator hook, extended armature wedge and protect tape, and vent is resistant to sucking gravel *Iron bearing bushing is provided in the commutator-side bearing chamber *Needle bearing of Gear Cover for extended durability *Easy-to-use snap switch *Spindle lock for easy wheel replacements *Double insulation Capacity Wheel Dia: 100mm(4″) Hole Dia: 16mm(5/8″) Spindle Thread M10 x 1.5 Power Input 715W No Load Speed 12,000/min. Overall Length 260mm Weight 1.5kg(3.3lbs.)