Frequently Asked Questions

Q – My router is not listed on the router compatibility table. Will the circle guide or adapter plate fit on my router?

A – Click on the router compatibility tab. For circle guides, scroll down past the circle guide compatibility table to the router mounting layouts. Remove the base plate from your router (if it is removable) and measure the distance between the mounting holes on the base of your router. Compare these measurements with the dimensions on the layouts. If you can find a layout that is the same it will fit. Ignore the manufacturers listed on the layouts as many manufactures use the same layout.

For base plates click on the router compatibility tab and scroll down past the compatibility table and layouts for circle guides and the compatibility table for base plates to the router mounting layouts for the base plate. Follow the same instructions as above for the circle guides.

Routers we don’t fit – Festool, Triton, Black & Decker RP250, Bosch 3.5 HP

Q – What router bits do we recommend?

A – For our M200, M270, and M400 circle guides, we recommend ¼ inch solid carbide bits with 1 inch cutter length. Straight bits are best for woods with thin veiners, otherwise up spiral bits work best. For the M300 circle guide use a ½ inch solid carbide bit. We do not sell router bits.

SHIPPING – We ship US domestic destinations via US Postal Service Priority Mail. Arrival time approximately 2 – 3 days. International destinations are shipped via US Postal Service First Class mail. Delivery times are about 10 business days.

Q – How do you use the butterfly template?

A – An inlay kit is required such as the Whiteside Part # 9500 which is not included. They are available at Woodcraft, Rockler and other woodworking stores. This kit has a Porter Cable style guide bushing with a removable collar, a centering pin, and a down spiral 1/8 inch diameter router bit. You use the same template opening for both the inlay and the pocket. Cut the pocket without the collar on the bushing. Cut the inlay with the collar installed on the guide bushing.

Q – Are Jasper Tools Adapter plates required for circle guides?

A – No. Circle guides have mounting patterns for all listed routers as defined above. Adapter plates replace base plates on non Porter Cable routers to adapt them to Porter Cable guide bushings.

Our Videos

Our circle guides are shown mounted on routers for illustration purposes only. Routers are not included with our products.

Contact Info

4800 West 34th Street C22
Houston, Texas 77092

Phone: (713) 681-9912
Fax: (713) 681-0576

Customer Service Available
9:30 AM to 3:00 PM
Monday thru Thursday