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ground hardened steel, the angle blocks can measurement and long term use Each angle block has 4 holes for easy installation The angle blocks can be used for calibrating and measuring the exact angle Including 1× 30-60-90 Degree angle block, 1×45-45-90 Degree angle block and fitted for case, easy to carry High: + / 20 Seconds, 0.0001 " per inches, Manufacturer: Tsophreniq