Using LSM-4, the external stop segments made of hardened steel can be placed vice versa by the user itself.
That means: flexibility depending on your space situation inside the application!
Notches and threads are already available on both sides of the product. Even a both-sided-stop-system is possible:
In scope of delivery the stop-block acts central, in both directions of the hub. Just buy another stop-block from accessoires and bolt it on the other side.
By the way: As its little brother (LSM-3) this linear-unit also is equipped with sealed recirculating ball bearing guides with 2 carriages.