韩国采购需求：步进电机、线性执行器、带齿轮箱的步进电机、微型步进电机、线性步进电机、混合式步进电机

I'm reaching out to see if you manufacture a specific type of motor. I'm particularly interested in a model with a motor outer diameter around 20 mm and a body length of approximately 11 mm, designed with a flat profile excluding the shaft. I'm looking for a product with an 18° step angle and available in either a 2-phase 4-wire bipolar or 4-phase 5-wire unipolar configuration. The rated voltage options should be 5V or 12V, utilizing high-performance neodymium bonded permanent magnets. Looking forward to your response!