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POLOLU STEPPER MOTOR: BIPOLAR, 200 STEPS/REV — Motor: stepper; 4.3VDC; Shaft: D spring; max.29mNm; 800mA vs POLOLU STEPPER MOTOR: UNIPOLAR/BIPOLAR 57×76MM — Motor: stepper; 4.5VDC; Shaft: D spring; max.1341mNm; 2A — Robotitem