t slot mounting plate - Letter box - Wikipedia diamond 888 slot

Electrical cabinet (envelope) sheet metal wall with mounting plate, specially designed for electrical distribution panels, cabinets for machinery, automation and control cabinets, air conditioning and air conditioning, etc.

T-Slot Mounting Hardware Guide for Aluminum Framing.

432-285 Mecmesin QC Type D Loadcell Mounting Plate, 19 mm slot, c/w M6 bolt for 500 N S-beam loadcells