The Shimano 2x11 speed Front Derailleur features synchronized shift, ensuring ergonomic shifting operation without stress, race endurance for less damage in crash, quick and smooth front shifting under high pedaling torque and it maintains compact and smooth appearance.
It has a top gear capacity of 50-55 teeth and a total capacity of 16 teeth.
Like the other modern front derailleurs, this FD-R9150 has one support bolt and only a top limit bolt. Setting the low limit is done electronically, as well as fine-tuning the top limit.
The process for setting the limits correctly is described on this page: set up one bolt front derailleur limits.
If you're trying to build a bike relatively cheap you might want to have a look at the alternatives to this front derailleur. DURA-ACE is top quality, but that comes at a cost.