Specifications:

4-inch brushed bare metal machine

4-inch brush, one electricity, one charge

4-inch brush, two electricity and one charge

4-inch brushless bare metal

4-inch brushless one electric one charge

4-inch brushless two-power one-charge

6-inch brush, one electricity, one charge

6-inch brush, two electricity and one charge

6-inch brushless one electric one charge

6-inch brushless two-power one-charge