Model:Hexagon  Socket  Head  Cap  Screws
Features:Used where there is narrow but need strong tension, and
                  the head of the screw can't protrude than the plane.
Specification:DIN,ISO,JIS:M2∼M36
                         ANSI:NO.2#∼3/4"
                         BS:W3/16"∼W3/4"