... , 23, 24, 34 and 42 and motor driver Step Angle: 1.8 or 0.9 Deg Nema 23 Stepper MotorFrame size 57mmwith ... .56SM57HT76-2804AB3.22.818.94More models available with different length.-1.8 1.2 and 0.9 degree-square, round, high torque, standard ... -effective from China Nema 23 stepping Motor, 57mm step motor, 1.8 or 0.9 Degree step angle