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This is the standard Porter Cable base plate for most 690 & 890 series routers.This base is mainly used in conjunction with Porter Cable or similar generic template guides for pattern work. Large opening sub bases can easily be made from lexan or polycarbonate materials of 1/4" to 1/2" thickness.These bases are specifically made for Porter Cable routers, but with a little engineering, you can adapt it for use with other routers.This base is black with some holes for viewing your work, but I much prefer a clear base.If you do a lot of template guided routing, you need one of these bases (along with a good set of template guides). Porter Cable has the industry standard for template guides & there's a good reason. they work.The center opening is a bit small for anything over a 1 inch diameter bit, so if you're going to be using a large roundover, chamfer, ogee or any other large bit, you're going to need another sub base.
This is a good alternative to the more expensive clear base with the 2-1/2" hole (that item was backordered and this standard base plate is usually available for less). It won't give you a huge hole like the 2-1/2" model, so you can't use a big slot-cutter, but you'll save money over the specialty clear base plate. Just enlarge the hole so it's big enough for larger bits like the the 1/2" roundover, and you can use all the larger 1/2" shank edge forming bits that wouldn't fit through the standard base plate hole. There's still enough meat around the six outer holes if you enlarge the hole to about 1-5/8" with a forstner bit or a holesaw on a drill press.
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