Freud Butterfly Spline Router Bits Furniture Or remove the top section

Or remove the top section of the rail bit to produce long tenons of any length for the strongest possible joints

or any project requiring precise tongue & groove joints with perfect finished surfaces

Adjust the length of the panel tongue by adjusting the fence position on the router table

Drilling handrails made easy

Freud Butterfly Spline Router Bits Furniture Or remove the top sectionThe Butterfly Spline is a beautiful solution for exposed joints. Two passes with this bit produce the concave butterfly spline from your choice of hardwood or softwood. Then use a 14 degree dovetail bit to (sold separately) to produce the mating grooves. For best results use in table mounted or CNC routers.