Dell Precision T3630 T3640 T3650 -  XPS 8920 8930 Aurora R9 

SSD / HDD hard drive case metal cage and blue plastic caddy 

Blue caddy is a 3.5 to Dual 2.5 tray which houses up to 2 s.5 inch drives

you will receive 2 sets - 2 metal cages and 2 blue trays

picture shows 1 set