This pyramid was designed to be used with the 55MM Ball Bearing Locks in place of an attachment plate.  The pryamid base has the hole pattern that matches up to the 55MM pattern on the lock, but the pyramid end that engages other components is adult size - eliminating unneccesary height and weight.

Our 55mm Ball Bearing locks have a 265 pound weight limit, making this combination ideal for a patient with a small residual limb.