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

This Alux aluminium slot profile 40x40 is 40 mm wide and 40 mm high The aluminium profile has 4 slots, 8 mm wide The depth of the T slot is 12 mm

T-slot Nuts are inserted into the aluminum profile grooves to connect one profile to another or to secure components to profile structures,

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