JessEm 10 Piece Insert Ring with Pre-Drilled Holes:

This is the most convenient and versatile solution to changing the bit-hole diameter in all JessEm router plates and lift systems. Molded from glass filled poly-carbonate for long life and durability and featuring JessEm's innovative tab-loc design.

You can install and remove our insert rings with the flick of our two-prong insert ring wrench. The set comes with pre-drilled center holes of  (with counter bored hole for use with standard template guide bushings), and 2-1/2" diameters.