The Model 290 Circle Device is designed to fit all standard wireless, trimming and compact routers and is ideal for making speaker cutouts, circular inlays, decorative discs such as small table tops, wooden rings, etc. It is the first true fit circle jig. This jig allows the craftsman to make 276 different sized cut-outs in 1/16" increments. The cutouts range from 1 inch to 18 inch. The jig features an easy-to-read scale that is calibrated for a 1/4" router bit. From The Model 290 Circle Jig is ideal for making speaker cut-outs and is the first true fit circle jig. This jig allows the craftsman to make 268 different sizes circles from 1 ½ inch to 18 3/16 inch D. The jig has an easy-to-read scale that is calibrated for a 1/4" router bit. The Jasper Circle Cutter Router Guide is here to provide you with the best solution to get the perfect circular cutout or decorative disc every time. The Jasper 290 Circle Guide is made of high quality tempered acrylic and durable. Equipped with perfectly designed swivel holes that hold all the pins in their designated place while you work, resulting in precise cutting paths. The Jasper 290 Circle Cutter Template allows you to cut up to 268 different circles from 1 ½" to 18 3/16" D to get your desired circular cutout shape. The circle template router guide template has a simple and readable scale calibrated for a 1/4 inch router bit. These circle cutter cutter guides have been perfectly designed for multiple common compact, trimming and cordless cutters including: AVID 104: Bosch COLT GFK125, PR10E, DEWALT DCW600, DWP611, KOBALT 1439333: MAKITA XTR01, MET. ABO M18M1808, MILWAUKEE M18FUUKEE EL2723 - 20, PCE 6430, 450PK, Rigid R86044B, R24012, RYOBI P601, CTOPO GO CT-370, HARBOR FREIGHT DRILL MASTER 64314. The router bit is the perfect tool - or perfect gift - for woodworkers, speaker makers and DIY enthusiasts. of any kind