Only Reed solid block dies have wide throats and extra-fine threads that actually pull the die onto the pipe, even if the burr is large. CNC-milled from solid tool steel, solid block dies are available in NPT threads. Chasers do not have to be individually set. Reed chasers are machined as a unit (not bolted in place) for perfect alignment. Lower cost and less weight are two more good reasons to use Reed solid block dies compared to systems requiring die changes. Use with Reed Threadguard Cutting Oil for better and faster threads and longer die life