Stopper Stopper Size 16 Bottom Diameter 15 mm Top Diameter 16 mm Overall Height 42 mm Material Borosilicate Glass Product Type Stopper Color Clear Autoclavable Yes Number of Holes 0 Standards Not Applicable Special Features Ground Joints for ASTM Standard Flasks Resists Abrasion and Water For Labware Type Jointed Glassware Liner Material Borosilicate 3.3 Glass