!Hammer Drive Anchor is a fast, easy-to -use expansion anchor made of special Zinc Alloy. The Nailing design eliminates the necessity for hole-spotting, decelops substantial holding power, makes the bottom of the anchor expanded and the fixture tightly locked in place. !The test values listed obtained by using 200-250kgs/cm Concrete(No aggregate). !A safe working load should not exceed 25% of stated value.