Specially contoured shape of the brush allows ypu to clean the battery terminals from the sediment that is on them. On one side there is a special brush to clean, on the other hand brush for cleaning the battery terminals. Clean the battery is essential for the proper operation of the system and car power charge . After cleaning operations should ge spread with sockets and terminals supporting special paset edectrical connection, burshes are made of chome-nickel steel which givers long life the tool and thorouh.