They are used to terminate speaker wire

It is primarily used to connect a mini-DisplayPort/Thunderbolt source to a DVI-D display

This LC fiber optic connector is a duplex connector used for 900um jacket

5mm Max Wire Gauge Screw Down Terminal Accepts 23AWG HDMI Version Supports HDMI 1

Connector SC Simplex Package Information

Neutrik DMX 4-pin Female to Solder D-Cut Receptacle security They are used to terminateThis connector is a 4 pin female receptacle with solder cups, nickel housing and silver contacts. Physical Characteristics Housing Nickel Connector Type XLR Temperature Range 30 to +80 Contact Plating 2 m Au over 2 m Ni Contacts Brass Insert Polyamide Locking Element Steel Ck67 Shell Zinc Diecast Shell Plating Nickel Gender Female Electrical Characteristics Capacitance between Contacts 7 pF Contact Resistance 5 m Dielectric Strength 1,5 kVdc