Orthographic projection stencil include arrowheads, linespacing pinholes.
Scola-Tec 30/60 set square, unbreakable with borderline guides at 10 and 15 mm.
Nuts and bolts stencil perfect for drawing side views, regular shape. Easier to use on T-Square
Scola-Tec unbreakable 45 set square with cross hatching and lettering guidelines.