Simple saddle installation, just remove your current stirrups and slip your new swivel and lock stirrups on. The system allows stirrup to rotate 360 degrees or it can be locked into any position for maximum comfort and also allows the fender to lay flat against the rider's knee. Guaranteed to relieve knee and ankle strain. Complete with 4 1/2" deep aluminum stirrup with cushioned rubber insert. 2 1/2" neck.