Radius measurements are stated but they are not, they are diameters. All are twice as small as advertised. Many places in the description say "radius" or "R", but one place says "intersection diameter" (followed by a list of fractional sizes, followed by the letter "R". Learn the basics of geometry, friends! The radius is half the diameter I make a dowel, and a 3/4" radius drill bit should turn a 1.5" square jar into a 1.5" dowel, not a 1.5" square rod with 3/8 inch rounded edges.