Mount Adapter for Front Derailleur High Clamp
This mount adapter allows you to mount a Front Derailleur to your frame. The frame clamp is located 'above' the derailleur.
High vs low clamp adapter
Which clamp adapter you need depends on your frame. If your frame has the space and clearance for the high clamp adapter, use that. Does your frame tubing or suspension not allow you to fit the high clamp adapter? Then use the low clamp adapter.