The wire clip is a kind of common power fittings, which are divided into two types: "detachable" and "crimping (compression)". Detachable types include parallel groove clips, wedge clips, etc. At present, various bolts and grooved wire clamps are still widely used, and the wedge-shaped wire clamps are also rapidly expanded. The feature of the detachable type is that it can be disassembled and can be used again. Most of this type of clamps are made of plywood, and the connection is completed by the tightening pressure of the bolts. When connecting, the contact surface between the clip and the wire is small, and the tightening force of each bolt cannot be averaged. Therefore, in general, the resistance of the bolt clip is higher than that of the compression clip.