The cabinet is IBM cabinet for data center collocation to mount servers and network switches/routers, with the wheels to move on the ground and bolts to hold it. Round rack holes. Part# 41V007 and below should be a good reference for it:
https://www.ibm.com/docs/en/power5?topic=diagrams-0553-7014-t00-7014-t42-racks
41V0087*
11P0313**
1 Frame (7014-T42, black, 2.0 m)
And
https://www.ibm.com/docs/en/power9/0009-ESS?topic=p7t7tr-model-7014-t42-7014-b42-rack
Rack with standard front and rear doors