CNC machined from "virtually unbreakable" polycarbonate plastic, these innovative jigs turn your woodworking router into a precision circle cutting machine.

The Model 200 PRO makes 256 different size circles from 2-1/4" to 18-3/16" in diameter in 1/16" increments.when using a 1/4" diameter straight router bit. These are commonly used for making speaker boxes for both home and car audio applications.

The Model 300 PRO makes 184 different size circles from 7" to 52-3/4" in diameter in 1/4" increments when used with a 1/2" diameter straight bit. Use this jig for projects like round tabletops and furniture features.

Both Jasper PRO circle making router jigs include a centering disk, 1/4"-dia. steel pin, and a variety of screws to make installation on your router fast and accurate. The jig is pre-drilled to attach directly to common router models. For best results, we recommend using a plunge router. Both jigs come with complete instructions.

When using these jigs, we recommend using an Infinity Tools Solid Carbide Upcut Spiral Router Bit for best results.
Package 115-042 below includes the Model 200 Jasper Circle Guide and an Infinity Tools 1/4" Spiral Upcut Router Bit.
Package 115-044 below includes the Model 300 Jasper Circle Guide and Infinity Tools 1/2" Spiral Upcut Router Bit.
Package 115-045 below includes the Models 200 & 300 Jasper Circle Guides plus both router bits.

NOTE: See the instructions under the "Documents" tab for a complete list of compatible routers. You can easily drill mounting holes in the Circle Guide for those routers not listed.