Keystone Snap-in Modules from Cables To Go provide a full range of solutions for voice, home networking, home office, audio, video and more. With the wide selection of snap-in modules, keystone wallplates and patch panels can be custom configured giving you greater control and flexibility. Insert Type: Banana Jack. Color Code: Black. Designed For: Snaps into patch panels and compatible wallplates and surface boxes. Application: Feed-thru coupler for audio applications.