DWK Life Sciences (Wheaton) Borosilicate Glass Double Sidearm Celstir® Spinner Flask, 1000 ml. Spinner Flask, 1000 ml, 130 dia x 250 mm H, Borosilicate Glass, Adjustable Paddle Impeller, Double, Sidearm, Cell Culture, Bottom Dimple To Reduce Cell Aggregation. Manufacturer Part #: 356884. SECO Part #: DWK-356884.