pin torx sealing anti tamper security screws .The groove of the screw is like a quincunx, and there is a small cylindrical protrusion in the middle, which not only has the function of fastening, but also can play the role of anti-theft. When installing, as long as a special wrench is equipped, it is very convenient to install, and the tightness can be adjusted automatically without worry. There is a ring of waterproof glue under the sealing screw, which has the function of waterproof.