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The Brown & Sharpe 599-555-3 adjustable double square with 4" blade length is used for layout and measuring in construction and machining operations. 4R graduations are marked in 64ths, 32nds, 16ths, and 8ths of an inch. The chrome-finished blade locks in place to ensure accurate measurements and marking. The hardened and ground head provides accuracy and durability. Brown & Sharpe manufactures precision measuring equipment and metrology hand tools. The company, founded in 1833, is headquartered in North Kingstown, RI.