The upper knife is made from high quality steel and is specific to your serger. Over time and use the blade can become worn which will affect the cutting performance. Some models come with a replacement blade. See your dealer for a maintenance check up and refer to the user manual for a replacement upper knife part number.
View an accessory to see which models it works with:
Upper Knife Replacement Blade
Part number: Varies by Model
This accessory works with the following models:
