Tie rod adjustment open-end wrench

An open-end wrench comprising:

• a clamping mechanism that clamps a hexagonal portion;
• and
• a rotation drive mechanism that rotates the clamping mechanism while the hexagonal portion is clamped, wherein
• the clamping mechanism includes:
• a pair of contact portions facing each other which is capable of directly contacting the hexagonal portion;
• and
• an open-close drive mechanism that causes the both contact portions to move away from and approach the hexagonal portion.

A tie rod adjustment open-end wrench comprising:

• clamping means for clamping a tie rod hexagonal portion by approaching a tie rod from a side of the tie rod;
• and
• rotation drive means for rotating the clamping means while the tie rod hexagonal portion is clamped, wherein
• the clamping means includes:
• a pair of contact portions facing each other which is capable of directly contacting the tie rod hexagonal portion;
• and
• an open-close drive mechanism that causes the both contact portions to move away from and approach the tie rod hexagonal portion.