Black Rubber Stopper #16 Solid. Top diam. is 5"(127mm). Bottom diam. is 3.5"(89mm). Height is 2"(51mm).
Weight is approximately 21.25 ounces.
Forensics Lab Supply Number 3730140.
Formerly Grau-Hall Corporation dba Grau-Hall Scientific.
NOTE: Unlike some inexpensive imported products, these stoppers are made to standard size and hardness specifications.