This is a replacement single steel base for Model 4 sorters. It is black powder coated, includes springs and feet pre-assembled.
It may be used for Model 1,2 or 3 but the spring mounting location must be re-drilled.
The plastic collection bins are optional. Note that this is a Sterilite 7 Qt./6.6 L Latch Box available at many Walmart and Home Depot stores.