34 mm is the thickness shared by all seven eutectic plates GEBHARDT lists on gebhardt.eu. Melting point, body size and article number are what tell the plates apart.

Melting pointFreezing temperatureArticle number (body, mm)
-3 °C-8 °C1006919 and 0004655 (480 × 280), 0044439 (615 × 378)
-14 °C-19 °C0047068 (480 × 280)
-18 °C-23 °C6081958 (480 × 280)
-21 °C-26 °C0074699 (480 × 280), 0074675 (615 × 378)

GEBHARDT asks for a freezing temperature at least 5 °C below the melting point and an air gap between plates; freezing takes 8 to 24 hours. Inside an Isotec container the plates sit on holder rails or a grid floor. Thickness alone does not say whether a plate fits a given container; the container model and its rail layout do. Tell us the container model and we confirm the fit with GEBHARDT.