A large 160mm blade designed for sectioning resin samples such as JB-4 and Technovit. This blade is used for sectioning the resin blocks with little to no surface artefacts.
The large blade can be returned for re-sharpening at a fraction of a cost compared to buying the blade from scratch, not to mention more sustainable. 
The larger blade is only compatible with revision 2 systems or upgraded revision 1 Optical HREM systems.