T-Square has a shape like the English alphabet T. It is completed of superior quality wood. It consists of two parts, namely stock and blade hat are attached to every other on the right angle. It has a straight, hard working edge. Occasionally this edge is completed transparent that allows viewing of the line underneath the edge of such blade.
The length of the T-square should be as like to fit with the length of the board. The T-square can move down and up along the working edge of the drawing-board and is utilized to draw horizontal lines. The stock of T-square is held definitely against the working edged of the board and after that lines can be drawn with a pencil close to the operational edge of the blade. Horizontal parallel lines are drawn with sliding the T-square down and up, holding the stock definitely against the working edge of such board.