Reduce splintering and tear-out, and keep small drop-offs from falling between the blade and wheels. These semi-rigid, plastic inserts snap in to replace your old, beat-up throat plate. Ideal for scrollwork, small or fragile parts, and woods prone to splintering, these inserts provide a solid base for your workpiece at very little cost. Will not dull your saw teeth. Sold in sets of 5.Delta inserts are 2-1/2 (OAD - Overall Diameter) x 2-3/16 (to lip).Jet inserts are 2-1/2 (OAD) x 1-3/4 (to lip).Imported.Rockler