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Use with standard Haglof extractor and increment borer handle. Available in chrome and Teflon finishes, these bits feature a core diameter of .169"(4.3 mm) and .200"(5.15mm) Constructed of quality Swedish steel.
The borer threading is also important and chosen depending on type of wood. There are two different kinds of threading available on Haglof borers:
The 2-thread is more suitable for hardwood, since it turns slower in the tree (8 mm per turn) and generates more strength when drilling.
The 3-thread will be faster and easier when penetrating the tree (12 mm per turn) & better suited for softwoods. A 3-threaded borer is 66% faster than a 2 threaded. If you require to test both hard & softwoods, the 2-thread option is the best choice.