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.