Wrenches applicable to all major industries, is the product of the demolition, equipment essential tool. Socket wrench sleeve Features: 1, suitable to withstand tension and compression forces of various types of two-way reinforced concrete structures, steel structures connected construction. 2, materials, energy, and without restricting the types of steel ingredients. 3, all-round connectivity. 4, can be prepared in advance, factory jobs, do not take up the construction period, all-weather construction. 5, easy to operate, fast construction speed, can greatly shorten the duration of the technical characteristics of reinforced connecting sleeve joint strength up to industry standards JGJ107-96 in A-level joint performance requirements. Thread-shaped, high precision, stable and reliable connection quality. Wide range of applications, for diameter 16-40mm. Ⅱ, Ⅲ grade steel in any direction with the diameter and position of the connection. Adjustable: reverse threaded sleeve type applies to turn iron steel cage peer connection can not rotate at the rebar. Construction speed: thread processing in advance and on-site pre-fabrication, assembly and construction. Energy saving, pollution-free, safe and reliable construction. When the hexagon socket wrench or twelve angle on edge size is less than or equal to 32MM, its hardness value is not less than HRC39, when more than 32MM, hardness of not less than HRC35.