The shanks are machine wet cylindrical ground to the exact diameter of 8.0 mm and thus have a perfect concentricity You will find 12 router bits which are packed in an attractive metal box. high quality carbide plates 3381866 6 pcs Straight Bit Ø8 x 30 x 90 mm Ø10 x 30 x 90 mm Ø12 x 30 x 90 mm Ø16 x 30 x 90 mm Ø18 x 30 x 90 mm Ø20 x 30 x 90 mm 6 pcs Rounding Over Bit R2 R3 R4 R6 R8 R10