2 Flute Binding Router Bit for a precise and thorough work!Diameter: 20mm.The set includes the bit, an allen key (2.5mm) and 5 bearings (9mm, 10mm, 11mm, 12mm and 13mm).6.35mm shank (1/4").9mm bearing to give 5.5mm rebates;10mm bearing to give 5mm rebates; 11mm bearing to give 4.5mm rebates;&nb..