concrete-screw-hexagon-head
CHEMITOOL FASTENERS Screw LV073-ZN Self-tapping Concrete 6,5X57 A18-Head: hexagonal and grooved.
-Thread: self-tapping.
-Special high-low 60º / 40º grooved thread.
-Thread: self-tapping.
-Special high-low 60º / 40º grooved thread.