Marvel® Air Tool Oil, 4 oz Bottle no checkout 938 in Wire Material Steel 938 in Wire Material Steel Wire Size [Nom] 0 and 347 stainless steels Controlled ferrite in the weld deposit gives excellent notch toughness at cryogenic temperatures Deposits a max of 4% carbon in the weld metal to minimize the formation of chromium carbides and consequent susceptibility to intergranular corrosion Used on food and pharmaceutical equipment Specially formulated for use in all piston type and rotary air tools as well as in line air lubricators Prevents rust formation while providing positive lubrication for smooth starting and longer tool life Assures maximum performance by dissolving gum and sludge that cut down tool speed and reduce power output