Check the listing for details. PP Corner Protector Triangle 47x12mm for Ceramic, Glass,Metal Sheets Black 20pcs. Condition: New. Listed at 11.27 USD. What is this？These are triangle shaped packaging edge protectors that are used in packaging sheets such as mirror, glass, ceramic, metal to protect corner from crushing, deformation and breakage.What will I get?Material: PP PlasticExternal Length x Width: 47mm x 47mm / 1.85" x 1.85"Internal Thickness: 12mm / 0.47"Thickness: 1mm / 0.04 inchColor: BlackIn the package of: 20 piecesIs there any advantages of the product?This is made of plastic, through the machine stamping once time forming, has a good toughness, not easy to break.How to use it ?Just place the protectors in the corner of your sheets.What should I notice ?Only suit for the product that thickness than 12 mm. Less than 12 mm will slide down easily.