The threads on this product are large 4-48. Goes very well with my dial gauge. I was shocked how small they really were. The longest tip was only 1-1/2 inches. As you can see in the picture, the rest is in the 1/4" to 3/4" range. And there are no extensions at all. So if you buy these to check your OT or WOT settings, you can forget about it. For the price and choice of tips I would recommend this. If you need more reach, just do what I did and buy a piece of 4-48 threaded rod for less than a dollar.
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