ROTHENBERGER , one of the leading providers of innovative high-quality pipe tools and equipment in sectors such as MEP, HVAC, fire fighting, facility management, oil and gas, trading, and infrastructure. Automatic die heads suitable for threading dies High-quality, precisely manufactured tapping jaws for Supertronic 4SE tapping machines For conical pipe threads BSPT (R) 21 / 2-4 " Size / 2.1/2 - 4”