Replaces the old blades. I tend to have a couple on hand and label them to use for different materials, which ultimately makes me have to replace blades a lot less often. Kind of like not using your fabric scissors on paper, if you know what I mean.
You get one set with your machine but it never hurts to have an extra pair. I sometimes use a smaller top plate if cutting a small die but always have this plate on the bottom. I highly recommend this accessory.
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