Sliding door single roller wheel, made in Spain; two per door.
A home owner from Isaibela, Puerto Rico says:
July 17, 2016
Plastic insert with one roller in each corner of sliding door. Connects vertical and horizontal metal parts that hold glass in place. One screw used to affixe roller to metal frame. May have been made by Gimenez Ganga company in Spain.
Tom from SWISCO responded:
July 18, 2016
Thank you for posting. Unfortunately I am not familiar with Gimenez Ganga company. Could you send us some photos with measurements so we can compare to our parts to see what would work for you?