Eijkelkamp 15.02.SA Water Well Drilling Set, Square 30 mm Connection used for the construction of hand-drilled wells in soils without very hard layers and with sufficient aquifer recharge, permitting small diameter well. A maximum depth of approximately 20 m can be reached. The maximum space for the filter is 108 mm diameter. Where the soil becomes less cohesive, the casing tubes are used to prevent collapsing of the auger hole. When reaching sand below groundwater level the percussion drills