The IOSSO Eliminator Premium Bore Brush for 6mm/.243 Rifles (19007) are made with a fiber that is cobalt blue which is a stiffer grade of fiber that allows for back and forth action unlike traditional brass and bronze type brushes. The fiber last approximately 8 to 10 times longer than other brushes. The brush is wound tighter and has more fiber per inch than any other brush.

Specs:

8/32 Threading