No. 4 - 50mm(2") wide cutter No. 4.1/2 - 60mm(2.3/8") blade, 255mm(10.1/4") long body
Stanley No. 4 & 4 1/2 Smoothing Planes
By far the most popular of this pair is the 245mm(9.3/4") No.4 with its 50mm(2") wide cutter. The No. 4.1/2, preferred by many professionals due to its wider 60mm(2.3/8") blade and 255mm(10.1/4") long body, its extra weight compared to the smaller smoothers seen as a slight advantage when used purely as a smoothing plane.
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