Method for making a wrench

A method for making a wrench, comprising:

• a step of formation:
• making a mediate member, a movable jaw and an adjusting member, which are made of metal;
• a step of heat treatment:
• applying heat treatment to the mediate member, the movable jaw and the adjusting member to enhance rigidity;
• a step of surface treatment:
• cleaning respective surfaces of the mediate member, the movable jaw and the adjusting member, coating an anti-rusting layer on the mediate member, the movable jaw and the adjusting member, and
• a step of combination:
• putting the mediate member in a mold and making a body by way of injection, wherein a material making up the body is selected from nonmetallic material or non-iron material, the body including a handle and a head, the mediate member integrally combined with the head of the body, and then the movable jaw and the adjusting member being moveably inserted within the mediate member;
• wherein as the material making up the body is nonmetallic material, the nonmetallic material is selected from carbon fibers or glass fibers;
• wherein the material making up the body is non-iron material, the non-iron material is selected from aluminum alloy or zinc alloy.