Brushing Tool, 1 In D, SS, Wire 0.0010 In

Is this brush for 1/2" fittings and pipe? Will it clean out old solder so that I can reuse fittings.

What is the smallest size tubing in the largest size tubing it will do

I just bought this 2-in-one brush, but I cannot figure out how to brush the pipe OD. Because the ID brush is in front of the tool, the pipe get difficulty to pass the ID brush and reach the OD brush.