Through-bolt gripping pliers with adjustable opening width

A gripping pliers with an upper extended handle (2) and a lower extended handle (1) which comprise a handle section (9, 7) and a jaw (8, 6) positioned opposite the handle section (9, 7), with the upper extended handle (2) and the lower extended handle (1) being hingeingly supported in relation to each other in a box joint and wherein the joint includes an engagement position and an adjustment position, and furthermore with an indexing pin (11) manually displaceable against a spring (19) in the direction of the joint for adjusting between the engagement position and the adjustment position,

• where the lower and upper handles of the pliers move in a planar motion,
• the lower extended handle (1) includes a slot in said joint area;
• the upper extended handle (2) is inserted through the lower extended handle (1) in said joint area;
• and,
• the indexing pin (11) includes a first area (13), a second area (14) and a third area (15), such that the first area (13) has a first diameter that is smaller than that of the second area (14) and the third area (14) has a larger diameter that is larger than that of the second area (15).