The standard central insert supplied with the router elevator and other UJK Technology router table insert plates has a 38mm diameter central hole. We are now able to offer a replacement for this plus some alternative sizes so that the space between the cutter being used and the edge of the insert can be kept as close as possible. We also offer a blank insert with no hole in case you want to create your own custom fit. Another option is a guide bush adaptor to enable the fitting of American style threaded guide bushes. The stepped central hole provides a secure accurate mount for your guide bush when carrying out template routing operations or curved work. Also available is a set of four inserts offering a considerable saving on the individual inserts. Set includes 12.6mm, 38mm, 63.4mm plus a guide bush adaptor.