Bendable spanner

A bendable spanner comprising:

• a driving head having a driving portion at a front end thereof for engaging with a screw means;
• a length of the driving head being L3;
• a pivotal unit;
• the driving head being pivotally installed to the pivotal unit;
• a length of the pivotal unit being L2;
• and
• a holding portion;
• one end of the holding portion being pivotally installed to the pivotal unit;
• a length of the holding portion being L1;
• wherein the length of L1 is greater than or equal to 1.5 times of the L2, and the length of L1 is greater than or equal to 1.15 times of L3;
• wherein a first pivotal block is formed at a rear end of the driving portion;
• the pivotal unit has an integral “H” shape which has two lateral sides and only one transversal rod connecting between the two lateral sides so as to form two recesses at a front end and a rear end thereof;
• the first pivotal block is located in the recess at the front end of the pivotal unit;
• a first pivotal shaft passes through two lateral sides of the recess at the front end of the pivotal unit and the driving portion so that the first pivotal block is pivotally installed to the pivotal unit;
• the holding portion has a second pivotal block;
• the second pivotal block is located within the recess at a rear end of the pivotal unit;
• a second pivotal shaft passes through two lateral sides of the recesses at a rear end of the pivotal unit and a hole of the second pivotal block of the holding portion so as to pivotally install the holding portion to the pivotal unit.