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3/8 x 16 Threaded studs
Available in 1/4 x 20 thread also, by far the most economical solution and they will never dull at the point. You'd of course need to use these with a nut and a washer.
Best of luck
Acman3, you'r on to something here :-)
On the other hand, the studs are very inexpensive and works incredibly well, they never dull or bend at the point. When using 4 or more spikes they are infinitely adjustable so that you can get a solid foundation and you'd of course use these with a jam nut so that they lock in place once adjusted.
All this for less than $1each, including the Insert, washer and jam nut.