Core Barrel with Roller Bits
1.Cutting ring with rock drilling bits helps release the internal stress of rock
2.When drill in the full fracture rock layer, crossing cutter makes it easy to carry soil
3.Kelly box: 130mm,150mm,200mm(optional)
4.Barrel adopts spiral wear-resistant strips for anti-attrition to prolong the service life
5.Many alloy teeth are used for higher drilling efficiency
