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A T-square is a technical drawing instrument that is primarily used as a guide for drawing horizontal lines on a drafting table. It is used by draftsmen. It is also used to guide the triangle that draws vertical lines. Its name comes from the general shape of the instrument where the horizontal member of the T slides on the side of the drafting table. Common lengths are 18", 24", 30", 36" and 42".

Catalog # Description EAN/UPC Unit of Measure Retail Price (2010)
8387.18 METAL T-SQUARE 18 INCH 014173288929 EA -
8387.24 METAL T-SQUARE 24 INCH 014173288936 EA -
8387.36 METAL T-SQUARE 36 INCH 014173288950 EA -
STS18 "STAINLESS STEEL T-SQUARE 18""" 014173151230 EA -
STS24 "STAINLESS STEEL T-SQUARE 24""" 014173151254 EA -
STS30 "STAINLESS STEEL T-SQUARE 30""" 014173151261 EA -
STS36 "STAINLESS STEEL T-SQUARE 36""" 014173151278 EA -
STS42 "STAINLESS STEEL T-SQUARE 42""" 014173151285 EA -
STS48 "STAINLESS STEEL T-SQUARE 48""" 014173151292 EA -
ATS112 "ALUMINUM SCHOLASTIC T-SQUARE 12""" 014173148599 EA -
ATS115 "ALUMINUM SCHOLASTIC T-SQUARE 15""" 014173148605 EA -
ATS118 "ALUMINUM SCHOLASTIC T-SQUARE 18""" 014173148612 EA -
ATS124 "ALUMINUM SCHOLASTIC T-SQUARE 24""" 014173148629 EA -
ATS224 "ALUMINUM PROFESSIONAL T-SQUARE 24""" 014173148636 EA -
ATS230 "ALUMINUM PROFESSIONAL T-SQUARE 30""" 014173148643 EA -
ATS236 "ALUMINUM PROFESSIONAL T-SQUARE 36""" 014173148650 EA -
ATS242 "ALUMINUM PROFESSIONAL T-SQUARE 42""" 014173148667 EA -
ATS248 "ALUMINUM PROFESSIONAL T-SQUARE 48""" 014173148674 EA -