An alternative to the standard brush rings is the new Full Plastic brush rings. These brushes are available from 5 "to 10" internal diameter. Outside diameter as required.
The brush is produced in Zig-Zag model as well as straight.
The advantage of plastic brush rings rather than the standard brush rings are several; the rings are a much lighter product. The brush rings will never rust. Furthermore, the brush rings are more environmentally friendly, the plastic ring can easily be disposed of and the plastic can be recycled.