SFP Cages designed for DWDM switch applications that require a riding heatsink to manage excess heat . These SFP Cages have a full metal shield for grounding and EMI reduction, press fit terminations and support double sided, belly to belly PCB mounting applicaitons. Connectors for these SFP pluggable cages need to be ordered separately, see stock number 680-9718 and 717-4391.