Woodstock W1044 4-to-2-1/2-Inch Reducer
Freud MM-008 8 MM Diameter Two Flute Straight Router Bit with 1/4-Inch Shank
1/8" Radius Rounding Over Bit
POWERTEC 70136 4-Inch to 2-1/2-Inch Cone Reducer
Festool 488030 Clamping ElemenTS 2-Pack