Such a tool as a screwdriver has long been of great popularity especially in everyday life. We can say that each home master now has his own personal screwdriver. This demand for this tool is associated with several factors. Firstly, this tool differs with a relatively low cost, due to which almost everyone can afford it. In the second, a screwdriver can boast of its effectiveness. This tool allows you to do work ten times faster. In principle, for many professional builders, this tool has become the main. Thirdly, the screwdriver is gaining popularity due to the fact that recently the popularity of those materials and those construction technologies that suggest its use have been increasing. In the repair, they often began to use the construction bitumen BN 90 10 costs it cheap.