The all-plastic stem is safer for use in glass bottles and fits a 3/8 " drill chuck. The cloth is not replaceable. All Clean Bottle Express bottle washers are designed to fit into any standard cordless drill with 1000 rpm motor. Simply attach to the drill, get the Clean Bottle Express wet, insert into your bottle and press the trigger of your drill and watch how easy the Clean Bottle Express quickly removes any debris or old deposits from inside your beer or wine bottle.