The listing is for 3D PRINTER GLASS (+ 4 FREE bulldog clips). 
Dimensions: 220mm X 220mm X 3mm.
Printers supported: Anet A8, Tronxy, Reprap, Prusa i3 and others.

4 bulldog clips are included in the listing for FREE. These can be used to secure the glass to 3D Printer Hot Bed.

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Important: Glass edges can be sharp.
*Ruler from the picture is not included.