✕DO NOT FORCE THE FIT
- Belting and heavy rubber force work — .065" is stiffer than the light numbers but still not the .083" belt-and-gasket gauge; for two-handed cutting through a conveyor belt reach for the full-size square points, guarded where policy requires.
- Sole leather and dense hide thinning — that is the sole skiver's (55190) .072" job, not a square-point cut.
- Fine close detail — the stiffer, longer blade is less nimble than the #1/#2 for tight-radius trims.
- Skiving, prying, scraping — a cutting knife with a square end, not a shaving, levering, or spreading tool.
- Choose the #4 for firm cut-to-line work; asked to do the delicate or the brutal, a lighter or heavier knife will beat it.