Do not attempt to get extra leverage on a spanner or pipe wrench by slipping a length of pipe over the handle of the tool.This can strain the tool to breaking point.Use torque adjustable wrenches.

• 不要试图在工具的把上加一管来获得额外的杠杆力，这么做会使工具因拉力紧张造成断点，可用有调节扭矩的钳。