Jaw openings range from 12 inches up to 36 inches, with common sizes of 12, 24, 30, and 36 inches.

The listings show clamping forces from about 300 pounds on lighter models up to roughly 1,500 pounds for heavy-duty parallel clamps.

Handles are often PA6+GF (glass-filled nylon); slide bars are typically 45# carbon structural steel or other steel/carbon steel; jaws are usually cast iron or steel depending on the model.

Yes—several items describe parallel clamp jaws or parallel clamp sets that maintain parallel faces to deliver even pressure and a tight fit on the workpiece.

The lockable 36-inch opening F-clamps list a 2-1/2 inch opening depth.

Many models offer one-handed operation with automatic or one-hand locks, plus quick-release levers or a one-button unlock; some also convert quickly between clamp and spreader modes.

Packages commonly include multiple bar clamps (typically 2 or 4) and a user manual; some bundles may also include spring clamps.

Product details list a 1 Year Limited Warranty for these clamps.

Weights range from about 3.41 pounds up to about 16.75 pounds across the available clamp options.

Many listings note an extended rod or extended-rod design that fits a wider range of material thicknesses, allowing the clamps to work with various sizes.