Stopper Stopper Size 13 Bottom Diameter 12 mm Top Diameter 13 mm Overall Height 36 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