Twisted brushes are composed of a filament fastened between two twisted wires.
This produces a helical shaped brush (see Figure 4.1 - twisted brush with helix simple).
If the twisted brush is installed on a mechanical system the metal “stem” is usually severed at each end. If the brush is for use as a hand tool, one end of the twisted wire stem is left unfilled so that it can be used as a handle, usually terminating in a circular loop (see Figure 4.2).
The end of the twisted brush can be folded over to create a fan-shape called fan (see Figure 4.2). The fan prevent the severed stem from damaging workpieces.
The main characteristic of twisted brushes is the small diameter of the core, making them ideal for internal cleaning of piping, grooves and channels, and hard-to-reach crevices. You can also use their flexibility for cleaning curved surfaces.