It is necessary to record that I only started RECENTLY utilser this wonderful device: before I weld using oxygen and acetyline, as standard, which requires much discipline combined with attention to details. Now! firft exercise was practiquer with this new thing using half power 60A Steel baton with 300mm length. The hood I found very comfortable, as effective. There a delay (adjustable) with the 'dimming' the little window - very good! Everything was in motion: the paneu of steel and around 1.7 / 1,9.mm. thickness; firsts of blows between stick and paneau I noticed 60A was too rise, because there was a sign in front of hot / arriaire of paneau. All other indications was normal: I continue with the practice. My impression that this little device address Pannels same thickness as those used in the manufacture corrosserie automobile Completion most thick the thickness seen in the medieval age of building restoration.