Increment Borer Chuck for Electric Drills

For boring treated lumber or poles with a reversible electric drill
Use together with Haglof hardened steel bits or Teflon coated standard core diameter 5.15mm(0.200") and two lengths, 100mm(4") and 150mm(6"). Core into the sidewall to the desired depth and back out the bit. The core will remain inside the bit until the next core sample is taken or extracted using an extractor.