20’ Orange Jacket Cable Assembly (only, no button brushes) Air duct cleaning cable system For use with all Nikro Button Brushes 4" - 18" brushes available. If you break the inner solid metal core, it will not be warranted. You can only break this if you turn faster than 320 rpm, or used coiled up, or used a non clutched drill. Inspect regularly that the drill and brush end are secure with an Allen wrench.