丝毫不差

絲毫不差
sīháobùchā
  1. accurate to perfection (idiom)
  2. precise to the finest detail

CEDICT

形容非常准确，毫无差错。

重編國語辭典

Entry Composition

1 丝毫 sīháo
  1. the slightest amount or degree
  2. a bit
2 不差 bùchā to not lack