What does 1_D stand for?

1_D stands for "One And One-Half times the Diameter"

How to abbreviate "One And One-Half times the Diameter"?

"One And One-Half times the Diameter" can be abbreviated as 1_D

What is the meaning of 1_D abbreviation?

The meaning of 1_D abbreviation is "One And One-Half times the Diameter"

What does 1_D mean?

1_D as abbreviation means "One And One-Half times the Diameter"