Internal Torx screw screw head dummy is plum blossom shape, and inner hexagon screws of the headform is hexagonal, the main difference between the two is here.

　　Description: inner hexagon bolt according to the type of the head can be divided into many kinds of, such as cylinder head screws Hexagon and hexagon flange screws, heavy head screws Hexagon, half round head hexagon head screws (pan head inside hexagonal screw). According to the material of carbon steel and stainless steel. There is also a national standard for a special non head six angle bolt. There are a number of flower shaped inside the six corner of the club head screws. But above these are the most commonly used in the cylinder head six angle screw