RT30 router table insert can help you to build your own custom router table. It’s suitable for 62 x 70mm installing hole distance woodworking router. This insert comes with an insert ring (31mm inside diameter). 4 set screws help you to make well adjustment on surface flatness. Router table insert plate and insert ring are made of aluminum alloy with anodizing surface treatment, provides wear-resistant, rust-proof and long life. Both insert plate and insert ring are CNC machined.