Sometimes referred to as spoons, these are the part of the increment borer that is used to remove the core from the bit. Extractors are typically 1.5" to 2" longer than the actual borer size. For example, an extractor for a 16" increment borer is actually closer to 18" long.
Extractors are available in several lengths in both 4.3mm and 5.1mm diameters
Lengths shown below refer to the size of the increment borer that they fit, not the length of the extractor itself.