The jaws are robust aluminium alloy on a 20 mm x 6 mm steel bar. These die-cast jaws are capable of applying substantial pressure to the workpiece. Squeezing the handle advances the moving jaw. The spring-loaded face is slightly angled so its top touches first as the jaws close. As pressure is applied, the spring compresses to ensure even pressure distribution. The fixed jaw is reversible to convert the clamp quickly into a spreader. The jaw faces have non-marring, glue-resistant pads and the clutch operates with a simple release. Lifetime Guarantee.-bg