Voltage: rated 17V, it is recommended to use 12V-24V, good voltage 12V. Speed: 12V 14700 rpm, no-load current: 350ma 24V around 28000 rpm, no-load current: 480ma Dimensions: outer diameter 27.5mm, body height 33mm Shaft length: 11.5mm, shaft diameter: 2.3mm Mounting hole: M2.5 Installation hole distance: 16mm, can match our shop 390 motor bracket!