Brilliant Tapping Trick on the lathe or mill

[Toolmaker51]

Rawlplug seems a familiar brand here, though cannot recall the trademark. There are 2 (if not more) versions, but reducing RPM and increasing torque are the intent. Reversible combine those and are well suited driving taps. They'll turn up easily enough on auction sites.
Don't confuse with tapping heads, nearly all depend on a turning drive spindle and tommy bar.
Here, IIRC one common brand is 'Versamatic', among other is another is 'Versa Driver' and 'Versa Tap'.
One known exception is the Hardinge TT, a terrific device works in either instance, many find cost prohibitive combined with the proprietary collets. But with a reversing spindle, its very compact, the pin (dog) clutch controls depth perfectly. Holds 0 size to 1/2" tap shanks.