✕DO NOT FORCE THE FIT
- Not a fit for either 4" head — the 33110 and 33120 take the 33170 pack, and a 3-1/4" blade in a 4" head is a mis-stock, not a workaround.
- Not a utility-knife or putty-knife blade: shaver blades belong in a shaver's angled head, where the geometry and guarding live; freehand use of a bare wall-width razor edge is how stripping jobs turn into stitches.
- Not a scraper upgrade for other tools — nothing else in the store is designed to hold it.
- And not the answer to a mixed shaver fleet — that question belongs to the Universal 33255, once its open facts resolve ⚑.