These brushes are produced for electrolytic pickling and using with mordant. You use them with a power source. It is not important for our brushes if you use AC or DC electric current. You bit for carbon fiber brushes / pickling brushes for cleaning of welding seams. You can erase with these brushes the tempering colors which are from the welding process at stainless steel V2A / V4A / AISI 206 / AISI 304 / AISI 316 or similar material which is quenched and tempered. For a longer standing, you should use them in a PTFE-tube (PTFE) and let the working end as short as possible. These tubes are temperatures up to 160°C and also chemical resistance. 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 them also for passivating and marking. Our brushes are produced of items which are used also in the electrical engineering. The protection cover of the brush is temperature up to 160°C and chemical resistance., Weight: 0.0992080179 Pounds, Manufacturer: HWIREUIGT