In addition to offering high torque, the PKP Series 2-phase bipolar stepper motors offer more variety of electrical specifications, more frame sizes, encoder motors and electromagnetic brake motors for the optimum stepper motor solutions. The PKP Series Bipolar Stepper Motors are available in 0.79 in. (20 mm), 1.10 in. (28 mm), 1.38 in. (35 mm), 1.65 in. (42 mm) and 2.22 in. (56.4 mm) frame sizes.