backdrop clamps

Listings include trigger-style spring clamps (often sold in multi-piece sets), deep-reach spring clamps, and bar- or F-style clamps with sliding or fixed heads.

Throat depths in the listings run from shallow to deep, typically about 1 1/4 inches up to roughly 7 inches.

Clamping force varies by model: lighter-duty clamps list around 260 pounds, while heavy-duty bar clamps are rated as high as about 4,880 pounds.

Some trigger clamps are designed for one-handed use and can switch from clamping to spreading with a button push; at least one bar clamp uses a one-handed pump action. Other bar clamps use sliding T-handles that require two-handed tightening.