This crankset from Quarq is used in conjunction with their spiders where the power meter is located.

This is simply an axle and pedal arms.

The pedal arms are 175mm.

The axle is designed for DUB and can therefore be used on a wide range of frames, as long as a DUB bottom bracket is installed.

To use this power meter, you need a spider that is mounted with 8 screws on the crankset.

The pedal arms are made of carbon.