Router Technologies EX 2080 Xtreme Xtension Professional Router Bit/Collet Extension Use with any router table or any router lift to give you the cutter height you need and convenience you will love; includes 1/4 to 1/2 adapter and hex key Short length and massive body eliminate deflection found with other extensions Dynamically balanced and machined from fatigue proof steel allows running larger cutters Quickly change cutters from above the table with a quick 1/4 turn of the wrench No need to search for your spindle lock or use a pair of wrenches to change bits again