Zinc alloy wing nuts are corrosion resistant in wet environments.

The flange distributes the load over a large area and reduces stress where the nut meets the material surface.

Tri-groove nuts are narrower than sloped and drilled spanner nuts to fit in tight spaces. Install with a tri-groove socket bit and either a drive handle or an open-end wrench.

Large threads cut into softwood such as particleboard for a strong hold.

A closed end seals out elements and protects the threads on these inserts from debris.

Mount these inserts flush or below the material's surface.