SN stands for Shallow National.
The frames are designed to fit the super box of the National style hive.
These frames are self spacing and require no additional spacers, they are Hoffman style.
SN4 frames also fit other hive types like the WBC, but differing hive types may accomodate varying numbers of frames.
It is very often only the internal measurements of the brood or supers that vary. Always check before ordering.
Some assembly required.
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