window roller powerful stability, detexious , anti-moving in right or left steel cover, nylon wheel. nonstandard size 1)ITEM NO: lily-p012)Materials: Aluminum Alloy , steel3)Finish: Brushed 4) Avaiable for glass door .window 5)Bearing capacility: 60-80KG6)Features and Function :powerful stability, detexious , anti-moving in right or leftwindow roller window roller