This Bel-Art Coplin staining jar design improves on the classic tapered square design with a larger opening for easier placement and removal of slides. The polypropylene screw cap is 5.3 cm in diameter, has a flat top, easy grip knurled edge, deep thread, and a seal ring to prevent leaks. Polypropylene jar features a 6 cm (2.36”) base diameter and 11.4 cm (4.5”) height. Steam autoclavable at 121°C (250°F), remove cap when autoclaving.