You bit for carbon fiber brushes / pickling brushes for cleaning of welding seams. You can erase with these brushes the tempering colors which are coming from the welding process at stainless steel V2A / V4A / AISI 206 / AISI 304 / AISI 316 or similar material which is quenched and tempered. These brushes are produced for electrolytic pickling and using with mordant. You use with a power source. It is not important for brushes if you use AC or DC electric current. These brushes are for cleaning / pickling of welding seams of the welding process by WIG, MIG, , TIG or for aluminum. With a useable fluid, you can use also for passivating and marking. For a standing, you should use in a PTFE-tube (PTFE) and let the working end as short as possible. These tubes are temperatures resistant up to 160C and also chemical resistance. brushes are produced of items which are used also in the electrical engineering. The protection cover of the brush is temperature resistant up to 160C and chemical resistance. Colour:Photo Color Material:copper + fiber type: M10 Package Contents: 1 x Brush Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.