English translation about glasses

This should refer to glasses that are frameless and have temples that can be bent freely, also called rimless glasses. As shown in the picture:

"3 piece drill mount", the following is the introduction found on the glasses website:

With its "3 piece drill mount", the same eyeglass frame can fit almost any size face.?

My understanding is that the lenses, temples and the middle piece are three pieces (3 pieces) that are combined through drilling.

The open temples at the back mean that the temples can be bent freely to fit the face shape.