Specification:Rated voltage: DC 5V 4-phaseStep angle: 5.625 x 164DC resistance: 200Ω 7percentage (25C)Insulation resistance: 10MΩ (500V)Dielectric strength: 600V AC 1mA 1sInsulation grade: ANo-load pull in frequency: 600HzNo-load pull out frequency: 1000HzPull in torque: 34.3mN.m(120Hz)Detent torque: 34.3mN.mTemperature rise: 40K(120Hz)Noise: 40dB (120Hz, No load, 10cm)Diameter: 2.5cm(0.98in)(approx)Width: 2cm(0.79in)(approx)Color: As pictures shown.Quantity: 1 setNote:Transition: 1cm 10mm 0.39inchNo retail package.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you.Package includes:1 x Driver Boards1 x Stepper Motors