This is a quick release clamp for holding strips whilst you trim them. This also doubles as a hull clamp allowing you to work with both hands on intricate work.
This special tool from Mantua performs like a vice except that the jaws can be adjusted to clamp on an angle (to accommodate tapered items such as spars). A quick release lever speeds the re-clamping process once the jaws are initially adjusted. Designed to be clamped on the edge of a workbench, the Strip Clamp can also be mounted on a "lap board" for more portability.
One of the more challenging tasks in planking a ship model hull is spiling the planking. Spiled planks take on shapes that are best formed by using this strip clamping tool, which was designed for this purpose. The clamp will hold very narrow and thin strips, even those used for double planking on European kits.