v-tongue and grove router bit

I have been searching for something that may not be made. Have seen lots of v-tongue and groove router bits on the Internet but most of them do not tell you what thickness boards they are for. Does anybody know if an adjustable v-tongue and groove bit is available for boards from 1/2" to 1"? Thanks.
Vic
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Have seen (southeasttool.com) wedge T&G from 1/2 to 9/8 stock. Have also seen some Chinese plywood vee cutters as you suggest (no source), with cutting cpability to 7/8.
Do not know about adjustables but would check Amana on that, probably the largest inventory in the world.
http://www.patwarner.com (Routers) ************************************************************ Vic wrote:

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