This insert fitted the opening in the table and sat about 10 thou below the surface of the table. A piece of adhesive tape as a shim and the fit was perfect. Clamped a stout board over the insert, raised the blade a couple of times and instalation was done. Something that previously took me a lot of time and messing around is complete in less than 5 mins and the final result is far better than I could have made from MDF or solid hardwood, making this one of the most cost and time effective saw upgrades you could make..