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		1. It is easy to install and not easy to slip after 
		installation. 
		 
		2. External carbon brush, more convenient to 
		replace carbon brush and long service life. 
		 
		3. Pure copper coil, cooling block, long life.
 4. Double ball bearing, less friction, better heat dissipation 
		performance. Thus reduce motor performance loss, higher efficiency, 
		greater torque.
 
		5.This product can adjust the speed, can adjust the 
		positive and negative rotation. 
		 
 
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