Blind hole drill with integrated water feed with gfci circuit breaker vr electronic control with tachogenerator constant speed control overload protection and speed selector wheel quick fit brass coupling for 12 water hose integral water feed through the drive shaft ensures optimum cooling of diamond bits for hand operation or for use on our bd 6 and bd 18 drill stands can also be used with flex pressurized water tanks gfci operator protector circuit breaker integrated in cord this machine is al