1.All of the spindles can work together to save your time and costs, while any one of them can work alone, too.2.We can supply 2-8 spindles for a machine. The number and power of the spindle are to be adjusted by the consumer''s needs.3.You can adjust the distance between two spindles to satisfy your requirements.4.The solid and permanent structure plus unique design make the machine with long service lite performs well.www.chinaengravingmachine.com