This is a 63 mm male to 51 mm female adapter that adds 4 mm of length. The 63 male thread is 6 mm long and the 51 mm female thread is 10 mm deep.
This is a 63 mm male to 51 mm female adapter that adds 4 mm of length. The 63 male thread is 6 mm long and the 51 mm female thread is 10 mm deep.