Procut 4Pc Utility Key Sey ALI-300-17

Square Keys: Usually two different sizes (e.g., 6mm and 8mm) for radiator valves and bleed screws.
Triangle Keys: For accessing electrical cabinets, gas meters, and water meters.
Round/Two-Way Keys: Used for elevators, subway doors, and public service panels.
Standard Cross Design: Often features a compact 4-way cross shape that provides balanced leverage for opening stubborn or rusted locks.