Jasper 200 PRO Circle Cutting Router Jig – Cut 256 Perfect Circles from 2¼″ to 18 3/16″ – Made from Industrial-Grade Polycarbonate – Guaranteed for Life – Empower Your Craft with Pro-Grade Precision

It does exactly what it advertises—cuts circles, and does it well. If I selected a 5 11/16 hole on the jig, it yields that measurement, which is perfect for countersunk speaker drivers.It doesn't fit the Makita XTR01Z LXT router, but I knew that before purchasing. Instead of complaining on the reviews, I just simply drilled new countersunk holes.I've never used a circle jig before, and this took zero effort to figure out the first time—line up the inch, align it with the fraction, and as long as you use a 1/4" straight bit, you'll get perfect measurements every time.As for price, yes, it's a tad on the expensive side, but you're not just paying for plastic—you're paying for the precision. Try making an easy to use, and adjustable jig accurate to 1/16 of an inch. It's still cheaper than buying a whole bunch of hole saws.

Precision at its best! After having a company use their CNC machine to cut out some holes in some expensive plywood and creating a mess I ordered the Jasper Pro. Twelve perfect holes later my project is now moving along more smoothly. And for about the same price as the two I had done by “professionals”. NICE!!!

Using this circle cutting jig with my Ryobi R165 router (not a plunge router). Technically, this jig should only work with plunge routers and there are only two Ryobi routers that work with this jig, but I happen to have an interposer adaptor to fit the R165 to a routing table and it by luck the adaptor has two attachment points that match the holes on this jig. Next, I have bits that can be used in lieu of a plunge router if the depth is less than 1cm, otherwise I need to pre-drill a hole for the router bit to cut deeper than 1cm (not an issue if I had a plunge router). Been cutting holes for speaker drivers with no issue using this jig. Finally, accidently knocked the router+jig off the work table on to a concrete floor, it hit hard but no cracks and no damage!

It would be a five star product if it wasn't over priced. For 50$ it shouldn't be made out of metal not plastic.

I bought this circle cutting jig to make seven arch pieces for a clock I'm making that has a rounded top, and the arch pieces must be cut very accurately to fit properly. This jig was easy to set up and use, and was very precise in cutting the pieces from 1/2" stock. This jig is used with the plunge base for a Dewalt 618 router.