They slide over square hole mounting rails used in racks and cabinets and are used along with M5 screws to mount equipment

MT-218-BK Telescopic Swivel & Tilt Ceiling Mount Bracket for Flat LCD/LEDs - Fits Sizes 37-70 inches - Max VESA 600x400 MT-219-BK Swivel & Tilt Ceiling Mount Bracket for Flat LCD/LEDs - Fits Sizes 23-42 inches - Max VESA 200x200 MT-252-BK Dual Swivel & Tilt Ceiling Mount Bracket for Flat LCD/LEDs - Fits Sizes 37-70 inches - Maximum VESA 600x400Dual Swivel & Tilt Ceiling Mount Bracket for Flat LCD/LEDs - Fits Sizes 37-70 inches - Maximum VESA 600x400 Approvals

It is used to receive IR remote control commands and emits the signals to the IR inputs of audio/video components

APC Smart-UPS SU2200BX120

85 mΩ/Km & below (20℃) Approvals c(UL) No Environmental RoHS Compliant Packaging Information Package Quantity 1 Product Weight 28

VGA, HDMI, RCA + Left/Right Audio Single Gang Wall Plate Kit - Stainless Steel APC Matrix They slide over square holeThis stainless steel wall plate kit consists of a wall plate, a VGA female to female port, a HDMI female to female ports, and 2x RCA audio female to female ports. It is compatible with standard North American electrical openings, data clips or surface mount boxes. Physical Characteristics Color Stainless Steel Material Stainless Steel Cable Length HDMI 6 inches Plate Size Single Gang Connector Plating VGA Nickel Connector Plating HDMI Gold Connector