What size T-slot nutsbolts do I want to get for the 20x20 Aluminum

T-SLOT NUTS t slot nuts and bolts T-Nuts and bolts for H frame Coal Ironworks Presses Comes as a set of 4 nuts and 4 bolts tiger slot 777 login T-BoltsStuds are produced to Din 787Din 6379 and Strength class 8,810,9 and Extra strength T-Bolts to Class Rhombus T-Slot Bolts to Strength Class

tip top totem slot Dimension of M5 T Slot Nut Designation of T-bolt and diameter of thread K Width