Rotring T-Square Head, Red

A replacement head for a rOtring T-square — the part that squares the blade against the edge of the drawing board.

The head takes all the wear: it is knocked against the board thousands of times, and once it loosens or goes out of square every horizontal on the sheet inherits the error. Replacing the head is far cheaper than replacing the whole T-square, and restores the accuracy of a blade that is otherwise still good.

• Restores square to a blade that is otherwise still good
• Cheaper than replacing the whole T-square
• The head is the part that wears — check it before you blame the blade