VEVOR Server Rack, 27U Open Frame Rack, 4-Post IT Server Relay Rack, 19" Server/Audio Network Equipment Rack Cold Rolled Steel, 23.5" Deep Heavy Duty Rack w/Casters, Holds Network Servers & AV Gear

What is the depth of the rack for the equipment?  The 31.5" dimension includes the casters, which is fine (I need those too), but I need to know if it'll fit the equipment we wish to mount.