Tool Wrap, 321 SS, 50 Ft. L x 10 In. WMfr # SSFW321 10 50 Item Tool Wrap Material 321 Stainless Steel Thickness 0. 002 in Features Reclosable Carton Function Helps Protect from Scale, and Oxide Buildup During Atmospheric Furnace Heat Treating, Protects Surface of Air Hardening Tool Steels, Creates Airtight Envelope Around Part, Can Use in Furnaces up to 1800 F Max. Temp. (F) 1800 Resists Chromium Carbide Precipitation During Exposure to High Temperature