This smoothing plane is slightly larger than the #4. However, the main difference between the two smoothing planes is that the body of the #4 ½ is made of ductile iron. The attachment for the plane blade is made of bronze, and, of course, this plane also features a Rockwell 60-62 A-2 steel plane blade. The plane is equipped with an adjusting wheel that allows you to precisely set the depth of the blade. The handles are made of cherry wood, providing not only a warm appearance but also excellent grip!