Schluter Dilex-AHK Satin Anodized Aluminum 1/2" x 1" Inside Corner 90 Degree

The I90/AHK1S/AE is a prefabricated corner for Dilex-AHK that eliminates the need for a mitered edge. It is used to create 90-degree inside corners. The legs of the corner slide into the profile making installation quick and easy.

eBay