This is a 4-pole brushless motor! Diameter: 29mm Length: 60mm Motor shaft: 4mm Motor mounting hole: 16mm & 19mm Kv: 4960 Continuous Watt: 480W Max. Watt: 630W/15 sec. Max Amp: 85A/15 sec Max. RPM: 60000 Resistance in Ohm:0.04 Ohm