559MM IADC537 Rock Reamer/drill Hole Opener For Water Well Reamer Bit

1.the durability of premium tungsten carbide inserts are improved with new formulas and new techniques for insert bit; 2.sliding bearing forms, palm-axis surfacing tooth carbide layer, inner cone hole silver; 3.bearing o-ring wear-resistant, high-temperature high in saturated nitrile rubber; 4.adopt limit the pressure and prevent drilling fluid into the lubrication system-wide rubber reservoir bag; 5.use of high strength and high toughness carbide teeth.