... PCS (4) Delivery Time: 1 month for 300,000pcs (1) Housing Materials: steel, aluminum alloy, zinc alloy. wheel material: PP, steel ... (2) surface: anodizing, zinc plated(3) it is used in sliding in door and window frame(4). with long ... (door roller, pulley for door and window,window roller,aluminum housing window roller,nonstandard window roller) sliding window roller(window roller ...