Brush motor 540 of the HT type suitable for racing cars, speedboats and more.Specifications:Spire: 16TTiming: adjustable on the motor casingWorking voltage: 4.8-v to 12v.Max. Eff. 85%rpm 26,200 rpm at 7.2 V (3.630rpm x volt)power 185 Wcurrent at max. Eff. 28 ATorque with max. Power 170 NmmSize:outer diameter: 36mmBody Length: 39mmShaft: 3.17.The warranty is Italian.