These router plate insert rings fit the Axminster Cabinet Router Table, UJK aluminium and phenolic router table insert plates and the Axminster or UJK router elevators. Being plastic means they will not damage the router bit’s cutting edge should they come into accidental contact. Supplied as a pack of four, each one with a different central opening. When fitting an insert ring chose the one closest to the outer diameter of the cutter. The ring provides support to the workpiece whilst still allowing for air flow for extraction. Central hole sizes are; 6.3mm, 12.7mm, 38mm and 63.4mm.-bg