Why Does Hand Tool Hurt People Sometimes?

In the modern family, each household will have a set of hand operated tools. In the manual use process, because of carelessness and do not understand the use of methods leading to their own or people around injured, what is the cause of the accident in hand tools? There are a number of reasons why injuries occur during the use of hand tools.
First, the damage may be caused by hand tools, such as some hand tools fly out because of out of control, or the user's body is out of balance because the tool is out of control, and the person in the vicinity is injured;
Second, hand tools are too sharp, the user does not pay attention during the process of use, thereby being cut by the edges and burrs of the tool;
The third possibility is flying debris produced in the course of the work, splashed on the user or the people around him;
Finally, there may be electrical accidents due to hand tools conduction.