Locking pliers

A locking pliers comprising:

• a fixed handle;
• a fixed jaw connected securely to the fixed handle and including a first clamping surface;
• a movable jaw cooperating with the fixed jaw and including a second clamping surface and movable and fixed pivoting regions;
• a movable handle pivotally connected to the movable pivoting region about a pivotal axis;
• a movable pivot unit including a pivot pin engaging with the fixed handle and the fixed pivoting region;
• a pivot hole disposed in one of the fixed handle and the fixed pivoting region, with the pivot hole configured to form a contour of a circular shape defining trailing, middle and leading regions, with the circular shape of the pivot hole having a first diametrical size and the pivot pin having a second diametrical size not greater than 0.8 times the first diametrical size, with the pivot pin received and movable along an annular trajectory relative to the pivot pin in the pivot hole and partially abutting against the contour of the pivot hole;
• and
• a biasing member engaging with the fixed handle and the movable jaw, with the fixed handle and the movable jaw subject to a tensional force of the biasing member;
• wherein the fixed and movable handles are movable from initial, locking, to tightening positions, the pivot pin has the annular trajectory in the pivot hole, and the movable jaw is pivoted closer toward the fixed jaw, and the pivot pin is in abutting engagement with the trailing, middle and leading regions defined from the contour of the pivot hole, respectively.