Colocation web hosting is a very unique kind of hosting in that it is not a service that leases web servers. Instead, colocation web hosting is simply a web server storage and maintenance service.
To clarify, you will not receive access to a web server when purchasing a colocation web hosting plan. This means you will need to have your own web server that can be shipped to the colocation datacenter for safe keeping and regular maintenance.
Web servers require strict maintenance and extremely clean environments that are often expensive to uphold. Instead of buying storage space that is unclean and full of contaminants that can harm your web server, you may want to consider a colocation hosting plan instead.