The heads listed fit any blade according to the sizes noted in the charts
on all combination squares, combination sets and bevel protractors.
Sizes 12", 18", and 24", and 300mm and 600mm are interchangeable.
When ordering, specify complete catalog number and length of blade.
Exception: Starrett 33J and 8 Combination Squares. (For these, see 33J
and 8 listings.)