This T-square is designed for accurate line drawing and cutting, the perpendicular plastic head allows you to line the ruler up so that your lines are square and level. - RISD Store
Adjustable head t-square with ruler cross member Vector Image
T-square - Wikipedia
José Pontes | Adjustable Acrylic T-Square Ruler for Perspective Drawing
Adjustable Drafting T-Square | ClipArt ETC
Temporary Adjustment T-square | ClipArt ETC
Helix Plastic T-Squares A3 A2 | Technical Drawing at George Weil
Drawing parallel lines using t-square Royalty Free Vector
140+ T Square Ruler Stock Illustrations, Royalty-Free Vector Graphics & Clip Art - iStock
T-Squares | MAU ART & DESIGN GLOSSARY|Musashino Art University
iplusmile Acrylic T Square Ruler, Graduated T Square Drawing and Design Tool, T Measuring Ruler for Carpentry, Drafting, Architecture, Engineering (17.7 Inch) : Amazon.co.uk: DIY & Tools