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The centering spike is 3/8" 304 stainless rod, but i would like to try 5/16", as i think that will make it easier to push the squash on yet still be strong enough not to bend. Please be careful of the spike! Make it long enough to get through the seed bowl of the squash and a couple inches into the neck. But if there is any chance of it poking you, then bang the squash on with a piece of wood so you can't get skewered.