Does anyone know if this is a stereo or mono needle? I also wonder if the other side is for 78s.

https://www.amazon.com/Parts-Express-ST-17D-Fisher-Replacement/dp/B0002ZPK2Q/ref=asc\_df\_B0002ZPK2Q/?tag=hyprod-20&linkCode=df0&hvadid=312165962058&hvpos=&hvnetw=g&hvrand=10118028763298337216&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9027156&hvtargid=pla-569806215043&psc=1&region\_id=674469