This Teflon / PTFE beaker is used to aid in the wet etching process of silcon disks and wafers. This beaker has a max outside dimensions of 7.4 cm (2.9 inches) at the spout and 6 cm (2.4 inches) tall. The inside dimensions are 6 cm (2.4 inches) diameter and 4 cm (1.6 inches) deep.