Caplugs 99192791 Plastic Corner Cap WCC-0250, Vinyl, Corner Covers for Glass or Metal Plate. Plate Thickness 1/4", Black (Pack of 200): Amazon.com: Industrial & Scientific
Corner Guards with Aluminium Retainers and End Caps | Protection Products by Pawling Systems UK
12ft x 3in, 90 Deg - 130 Surface Mount Corner Guard