To a T/tee
Definition 1 of 1
Pro Tip 1/3Precision Emphasis
Use 'to a T' when emphasizing the high accuracy or perfect suitability of something. 
He memorized the instructions to a T.
Pro Tip 2/3Cultural Knowledge
This phrase is rooted in English culture and may not translate directly in other languages. 
The custom-made suit fits him to a T.
Pro Tip 3/3Exact Match
'To a T' suggests a perfect match or fit, leaving no room for error or difference. 
This key fits the lock to a T.