2 flute with upper ball bearings. Very useful for template and pattern routing where the template is on top of the workpiece. Ball bearing guide rides against the template for an exact duplication. If used on a router table, the pattern will be on the bottom, below the workpiece. (Replacement bearings and replacement collars sold separately as part #'s AM47701 and AM47724).Shank Diameter: 1/4"Note: AM45750 is for decorative purposes and is not intended for mitre-folding.
