Methodology guide
Limits, mounting rules, and when to stop shopping this ladder.
Calculator
Bench vise size by max jaw opening
Enter required max jaw opening in inches. Get a 4 / 6 / 8 in jaw class or NO_MATCH. Bolt to a sturdy bench; eye protection; keep hands clear of pinch points.
Result
Worked checks: 3.0 in → 4 · 5.5 in → 6 · 7.5 in → 8 · 10 in → NO_MATCH. classLbs uses jaw-width class ids for CTA matching.
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