| 主权项 |
1. An open wrench comprising:
a head having a handle and a driving portion which has an opening defined through a front end, a top and a bottom of the head, a first layer and a second layer formed on each of the top and the bottom of the driving portion, the second layer formed on the first layer, the first and second layer located along the opening of the head, the second layer having a first top face defined in a top thereof, the first top face being a flat face, the first layer integrally formed on a flat face of the driving portion, a periphery of the second layer extending and connected to the first top face inclinedly, an area of the first top face being smaller than an area of a top of the first layer, a third layer extending from a middle portion of the first layer and toward the handle, a fourth layer extending from the second layer and toward the handle, the fourth layer having a second top face defined in a top thereof, the second top face extending toward the handle, the second top face being a flat face, the fourth layer integrally formed on the third layer, the third layer integrally formed on a flat face of the handle, a periphery of the fourth layer extending and connected to the second top face inclinedly, an area of the second top face being smaller than an area of a bottom of the third layer. |
