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Jasper Tools has been designing and manufacturing high quality router accessories since 1998. Their Circle Guide is the first true one-pass (no trial cuts) and only circle guide you will need for your plunge router. Made from virtually unbreakable polycarbonate, the Jasper Pro series guides are incredibly durable and easy to use. The 300 PRO is scaled in inches and is calibrated to make cutouts using a 1/2" router bit. Jasper's circle guide pivot holes are precision-drilled so that the guide holds the pin in the selected hole without falling out, even when you turn your router over. The guides also feature predrilled mounting holes and come with a dowel pin and screws for mounting to your router. Instructions are provided and include information on calibrating to other bit diameters. The Jasper Model 300 PRO guide allows you to make 184 different size circles from 7" to 52-3/4" in diameter, increasing in size in 1/4" increments. Please see photos for router compatability. This combo inclues a 1/2" straight router bit from Whiteside. Made in the USA!