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They are all that long (i dunno why. So that's the "correct " size)
My dad sawed a piece off of mine so it wouldn't poke through.
mines in storage, so i can't measure it now tho, sorry.
mine poked through as well. there is supposed to be a large plastic cap, a couple of inches across at the top, to keep it from doing that. I think it is supposed to support the mat in the middle. problem is if the cap is misplaced you get a hole...