A plastic tube and plug, used for large specimens. The pin mount ⅛" (3.1mm) in diameter is inserted securely to the plug and protected by the tube. Pin mounts can be up to 38mm diameter. Ideal for storage or mailing. Measurements are as follows: Internal Diameter of the tube is 1.53" (39mm). The outer measurements of the tube is 1.57" (40mm) x 2.95" (75mm). Max height of sample on stub is 1.18" (30mm).