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High Torque 2 Phase 4 Wire 1.8 degree Geared Box Gear reducer 57mm NEMA 23 Stepper motor, US $ 28 - 35 / Piece, Guangdong, China, Casun, 57SHD4934-4G1.Source from Guangzhou Fude Electronic Technology Co., Ltd. on Waimaotong.com.