Specially designed to fit the 2017 series Durarumin plastic bicycle bottles (diameter 2.9 inches (73 mm)).
Primarily for users who focus on light weight and ease of removal of bottles
*About Duralumin 2017 series
The JIS standard is an alloy of aluminum and copper that belongs to the line called the 2000 series alloy. This material is incredibly lightweight and durable.

Dura-Cage is designed to fit bicycle poly bottles (73mm diameter), unlike other PET bottles or cans for drinks.
Does not include mounting bolts. Please prepare it by yourself.