Cangzhou Great Drill Bits Co.,Ltd

High-precision machined plain bearings, bearing contact surfaces are reinforced with high wear-resistant alloys and silver plating, making the bearing surface smoother, less friction during rotation and longer life. 1. Suitable for low compressive strength, high drillability of extremely soft low layers, such as clay, mudstone, etc. 2. Suitable for medium layers with high compressive strength, such as medium soft shale, anthracite, medium soft limestone, medium soft sandstone and intermediate layer with hard sandwich.