The Singer Overlocker Upper Knife 0412585000. It has a carbide tip for cutting strength and durability. This Singer Serger blade fits several models and we’ve listed them below. Remember that all overlocker knives will, eventually, wear out. The cutting edge becomes dull and sometimes blunted. The obvious sign of wear and tear is a rough cut. Take care that it isn’t just thread or lint trapped between the upper and lower knives. So ensure you clean your Singer Overlocker knives on a regular basis. This Singer Overlocker Upper Knife fits, 14U554 14Sh754 14SH654 HD854
