try "one piece t square"
https://www.amazon.com/Better-Office-Products-Architect-Companion/dp/B09RTS77V6/ref=sr\_1\_7?crid=3NARPI5GPWFQ6&keywords=one+piece+t+square&qid=1688151529&sprefix=one+piece+t+square%2Caps%2C119&sr=8-7