a locking wheel nut key, specifically an Audi locking wheel nut key with code '817' and letter 'T'.
Explanation:
Function:
This key is used to remove or install specialized locking wheel nuts on car wheels, which are designed to deter theft of the wheels.
Design:
It features a unique internal pattern that matches the corresponding locking wheel nut, allowing it to engage securely for removal or tightening.
Application:
This specific type is commonly associated with Audi vehicles, indicated by its designation as an "Audi New Locking Wheel Nut Key".