- SEM Specimen Stubs, 12.5mm dia, 3.2 x 15mm pin AGG3325SEM Specimen Stubs for AMRAY instruments. 12.5mm dia, pin length 15mm. Aluminium. Special prices valid while stocks last.Average lead time: 43 daysSpecial Price £49.46 was £67.51 You save: £21.66 (27%)Average lead time: 43 days