مفتاح مزدوج الجانب لخزان غاز اللحام
مفتاح ثنائي الجانب لاسطوانة (لخزان) رش الصبغ

ولكن المعروف ان هذه المفاتيح معروفة انها لاسطوانات غاز الاوكسجين او غازات اللحام الاخرى

It is a poor description for cylinder tank wrench the one with double sided key.
Double sided wrench (key) for tank (cylinder type).
Meaning :
The tank is cylinder shape and the wrench is double sided key.
الخزان اسطواني الشكل والمفتاح ثنائي الجانب

Wrench with double sided key same as in this photo
https://www.dairytrain.com/store/images/P/CTN-000-001R9NS02....
taken from this website:
https://www.dairytrain.com/store/wrench-dual-tank-13-3-8-l.h...

And this photo :
https://i.ebayimg.com/images/g/tcoAAOSwQb1a~hUW/s-l300.jpg

And this:
https://i.ebayimg.com/images/g/cm4AAOSwR~pcvfz1/s-l300.jpg
https://www.ebay.com/itm/Vintage-Airco-Torch-Gas-Tank-Wrench...