Guardian Trench Box G-Rail Receiver* Best in class precision adjustment Able to precisely adjust to trench boxes with wall thickness ranging from 1 4 up to 8. * Versatile and adaptable Able to fit two Guardian G Rails per receiver with a third connection option for alternate guardrails. * Lightweight and portable At only 14 lbs it is easy to handle and install with the included carry handle. * Unique patented design includes a proprietary low profile adjustment wheel for quick