15 Different Positions of Milling Cutters :: Straitement - 3 mm > concave-box-6.35 mm; > Drill-box concave-6.35 mm > Dovetail-22.7 mm > Drill Round-6.35 mm > Straitement - 7 mm > Groove Cutter Trim - 12.7 mm > Straight - 16 MM > Pocket Box Drill - 3.17 MM > 45° Bearing Chamfer Drill - 32 MM > Straight - 6 MM > Round Drill - 9.5 MM > 90° V, 12.7 mm > Roman Curved Bit-4MM > Straight-12MM . 1/4" Shank Diameter:: All bits feature a precision 1/4" shank diameter, fits all 1/4" routers, a set of forged steel cutters with high quality carb blades for professional woodworking. Note: The data are all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.