Jessem 02026 Insert Ring Set-Zero Clearance 59701 Description Introducing the Jessem 02026 Insert Ring Set, the most versatile and convenient solution to changing bit-hole diameter in all JessEm router plates and lift systems. Made from solid phenolic and featuring the exclusive TAB-LOC design, these insert rings can be easily installed and removed with JessEm's unique two-prong wrench. Upgrade your routing experience with JessEm's pre-drilled center hole insert ring set. Features: The Jessem 02028 Insert Ring is the most convenient and versatile solution to changing the bit-hole diameter in all JessEm router plates and lift systems. Precision machined from solid 1/4" thick phenolic and featuring JessEm's exclusive TAB-LOC design. You can install and remove our insert rings with the flick of JessEm's unique two-prong insert ring wrench. JessEm now offer two insert rings sets, one with pre-drilled center holes of 1/4", 1/2", 1-3/8" and 2-1/2" diameters and the other with no pre-drilled center-holes for making your own zero-clearance inserts.