metal corner splines

is there anybody out there who knows where to get metal corner splines for trimwork/pictureframes??
they are shaped like an arrow and the 2 edges have ridged on them (so if you looked at it from the end it would look like an I or a really wide H.
you route a slot in the cut end of two corner pieces of trim and put them into a clamp and then nail this spline in from the outside corner to permanantly join the two.
any help would be GREATLY appreciated
thanks in advance
paul
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google clamp nails.
ua100
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