Staedtler Triangle Holder

I made a holder for my Staedtler triangles and a ruler that I already owned, I lost my protractor and ruler from the set but wanted a place to keep my triangles.

https://www.google.com/shopping/product/2645761967419213845?lsf=seller:7933,store:9319291421377932908&prds=oid:2986733090639154687&q=Staedtler+triangles&hl=en&ei=ODBIW8XLF4GvggeHvK74Aw&lsft=cm_mmc:PLA-_-Google-LIA-_-870881882-_-449761&lsft=gclid:Cj0KCQjw-JvaBRDGARIsAFjqkkrHxVYKWY4_8P_5M0cIrl9ljrl7aw6dPjeHDg6OHWVwRR7TSj8jbNIaAkNEEALw_wcB

Link to the exact model of triangles this was designed for