Imperial Narrow Plane Blades for the Veritas Router and Hinge Mortise Planes

Yes, these blades fit Stanley #71 router planes, but you'll need to invert the height-adjustment nut for a proper fit, since the blades were designed primarily for Veritas router and hinge mortise planes.

As well as the set of five, each size is available individually, so you can start with just the widths you need and add more later.

Yes, metric sizes are available separately from the Imperial sizes, and the 1/8" Imperial blade is the same size as the 3mm metric blade if you need a direct equivalent.