Black Rubber Stopper #6 Solid. Top diam. is 1.260"(32mm). Bottom diam. is 1.024"(26mm). Height is .984"(25mm).
Approximately 21.5 per pound.
Forensics Lab Supply Number 3740110.
Formerly Grau-Hall Corporation dba Grau-Hall Scientific.
NOTE: Unlike some inexpensive imported products, these stoppers are made to standard size and hardness specifications.