Both left and right handed
Hold bottles well (Fouriers bottles)
Can mark bottles
15\15, we do recommend
Good cage is a cage that never loses a bottle. This cages was used with Fouriers bottles. No bottle loses so far.
Coolest thing is you can take one with left load and one with right load. If you are using two bottlecages inside frame (classic hardtail) and want to take both bottles from one side, you need cages with different load side.