Features: Dust-proof ball bearing Tool-less wheel guard can be adjusted to any angle Long life carbon brushes More durable ball bearing retainer Wear resistance of armature coil Powerful 2,400 watt motor Specifications: No Load Speed: 6,600 rpm Length: 478mm Weight: 5kg Brush: 999061 Power Input: 2,400 watts Wheel Diameter: 230mm (9″) Hole Diameter: 22.2mm (7/8″) Spindle Thread: M14 x 2