Water Containment for Core Drilling - 2 pc Set. The water containment consumption ring is used to hold water spelling drilling holes on granite, marble, and otherwise piping surfaces. Water will as temperature change and filling agent when drilling with diamond core bits, thus increase the speed of drill as well as life of the bits The set comes with a water ring of 3 '' in internal diameter for diamond core bits of up to 3 '', and a 1-1/2 '' in internal diameter for diamond core drilling of up to 1-1/2 ''.