IRWIN Tools Tri and Mitre Square (1794473) Squares are used as measurement tools and for marking 90 angles Squares feature a rust-proof, stainless-steel blade Black, precision-etched scales are easy to read High-impact ABS handle for durability 8" length Squares are used as measurement tools and for marking 90 angles Squares feature a rust-proof, stainless-steel blade Black, precision-etched scales are easy to read High-impact ABS handle for durability 8" length