These replacement blades are meant to be used for the No. 4 and 5 of the Busy Bee line of planes. They are made from O1 steel are hardened to 58-62 HRC can also be used in most vintage Stanley-type planes. Whether you have used-up a blade or want a second blade to sharpen differently, these blades will defiantly fit the bill.
Made from O1 steel that takes a fine edge
Hardened to 58-62 HRC
Blade width: 2”
Blade thickness: 3mm
This is my fourth attempt at providing a review, but for some reason it isn't being published by this company. I guess it would give them a bad image. At any rate, the description of this replacement blade is that it's incorrect, as it will not fit a vintage Stanley plane because it is thicker than the original which was 3/32nds and not 3mm. Because the replacement blade is thicker and narrower, the Bailey screw that connects the blade to the chip breaker isn't long enough to combine the two pieces together. I learned the hard way and could not return the product because the original packaging was accidentally put in the garbage before I figured this out. My bad. Lesson learned.