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2. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   As 535 mm is very close to 21 inches, these racks are sometimes called 21-inch racks. The gap between the posts is 500 millimetres (19.69 in). As 19-inch equipment has a maximum width of 17+1⁄4inches (438.15 mm), they can easily be mounted in an ETSI rack by means of an ETSI bracket or adapter plate.

3. Mat (picture framing) - Wikipedia

   en.wikipedia.org/wiki/Mat_(picture_framing)

   In the picture framing industry, a mat (or matte, or mount in British English) is a thin, flat piece of paper -based material included within a picture frame, which serves as additional decoration and to perform several other, more practical functions, such as separating the art from the glass. Putting mats in a frame is called matting, a term ...

4. Photovoltaic mounting system - Wikipedia

   en.wikipedia.org/wiki/Photovoltaic_mounting_system

   Photovoltaic mounting system. Photovoltaic mounting systems (also called solar module racking) are used to fix solar panels on surfaces like roofs, building facades, or the ground. [ 1 ] These mounting systems generally enable retrofitting of solar panels on roofs or as part of the structure of the building (called BIPV). [ 2 ]

5. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

6. Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Bottom_bracket

   Bottom bracket. Aerozine ceramic external bottom bracket bearing cups for BSC / ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom bracket shell. The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It contains a spindle to which the ...

7. Bracket (architecture) - Wikipedia

   en.wikipedia.org/wiki/Bracket_(architecture)

   Bracket for a shelf or hanging items. A bracket is a structural or decorative architectural element that projects from a wall, usually to carry weight and sometimes to "strengthen an angle". [1][2] It can be made of wood, stone, plaster, metal, or other media. A corbel or console are types of brackets.