scraper putty knife 1.carbon steel material 2.blacked and polished treatment 3.construction tool 4.different specifications Scraper,Putty Knife Scraper,hand tools.1)Scraper razor blade steel :CARBON:40Mn, NO.45, NO.50, NO.60,65Mn.Stain Steel: SUS420, 3Gr13, 3042)Blade Hardness:CARBON: HRC 48-52STAINSTEEL:HRC 45-48 multi-purpose putty knife for garden use