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Comparison : Item # KR42HM4-551, KR Series, 3 phase Permanent Magnet (3.75 Degree/Step) - Nema 17
Item # KR42HM4-552, KR Series, 3 phase Permanent Magnet (3.75 Degree/Step) - Nema 17
Item # KR42JM4-551, KR Series, 3 phase Permanent Magnet (3.75 Degree/Step) - Nema 17
Item # KR42JM4-552, KR Series, 3 phase Permanent Magnet (3.75 Degree/Step) - Nema 17
Item # KR42KM4-551, KR Series, 3 phase Permanent Magnet (3.75 Degree/Step) - Nema 17