... hardness of geological features; They are used for core sample, water well, geothermal well, SPT..... Project case------100-250m depth ... 3) Strong structure and scientific design enable them to drill water well deep and with large diameter;4) Durable parts, ... accessories, like rod, bit, core barrel, rope, and so on. Main parameters------100-250m small water well drilling machine: ModelDLX-130YDLX- ...