https://www.shorenz.co.nz/KS100_Trench_Boxes.php
Hirepool Shoring : Trench Boxes : KS100 Trench Boxes
Suitable for trenches up to 3.7m deep and from 600mm to 3.3m wide. In some situations the KS100 system may be used to depths of 4.8m
trench boxesshoring
https://purchasing.idaho.gov/portfolio/trench-boxes-shoring-standard-emergency/
Category 29 - Trench Boxes & Shoring Archives - Division of Purchasing
trench boxesdivision ofcategoryshoringarchives