... 5,700 Ounce-InchesStep Angle:1.8 and 0.9,3.6 Degree,Square-Bodied, High-Torque Stepper Motors. Round version, Standard ... and 42Frame size: 20mm, 28mm, 35mm, 39mm, 42mm, 57mm, 60mm, 86mm, 110mm, 130mm Nema 34 Hybrid Stepping Motor, Frame size 86mm, with different ... length and holding torque