Will this clamp work for clamping larger panels or assemblies?

The 4" opening handles most bolt-on panels and smaller assemblies. For wider components, you'd need multiple clamps or a larger capacity model — test your panel width first.

Can I use this on painted or powder-coated parts without marking them?

Direct metal-to-metal contact will leave marks. Slip a thin scrap of rubber or cardboard between the clamp jaw and your part to protect the finish.

Is this clamp suitable for vertical or overhead clamping?

Use caution. Cast clamps rely on screw tension to hold load — gravity pulling down on an overhead setup can cause slippage. Best suited for horizontal or bench work where the clamp screw is doing the primary holding work.