Johnson drywall t-squares are essential drywall marking tools for making cuts at right angles. The unique rivet assembly of Johnson drywall squares permanently “bonds” the head to the blade at a perfect 90° angle. Johnson Level offers 48” drywall squares and 54” drywall squares to accommodate all drywall sizes. Johnson Level also makes an adjustable t-square which can be set to any angle, and any height between 25” and 48” The adjustable t-square folds flat for easy transportation. For the best features in drywall squares, Johnson Level is the name to trust.