Our general pipe cleaners DHBG down head boring gimlet drain cleaner cutter is used for removing loose objects (goes down waste, not up the stack) and is used on 3/8Inch drain cleaner cables.From the ManufacturerGeneral Wire Spring Drain Cable Boring Gimlet. Down Head Use only on snakes with connectors Drain Cable Boring Gimlet. DOWN HEAD BORING GIMLET. Replacement Part.