Thought I would share my experience recently with an Amazon product:
I bought this dial indicator thinking that it would be cost effective for hobby use as opposed to shelling out for a Mitutoyo, Starret, etc.
Product comes quickly, no issues. You will notice that it is advertised as coming with two stems: a 7/32" and a 1/4". Well the 1/4" would be ideal for using with our Makita or Dewalt standard size collets. Unfortunately, when I received mine it came with a 5/32" and 3/8" stems. Upon contacting the seller (HHIP) to get the right advertised stems, they told me there was nothing they could do, because I bought it through Amazon as opposed to buying from HHIP directly. I tried to explain that I’m not sending it back to Amazon, as how would I know that the correct stems would come at all? So I left a bad review and gave up.
Instead I kept the dial indicator which otherwise works, and bought this universal mount (which I can confirm IS .25" in diameter. Problem solved. Buyer beware.
On the upside I learned some more and now have some idea how to indicate vises and stock. This will be a nice tool for helping me tram my wasteboard when I replace it again.