Used when fastening to concrete or brick. A hole is drilled through the material and into the concrete. The anchor is inserted into the hole and through the material till the head is flush. Then the nail is hammered flush against the anchor which spreads the anchor apart and secures the material to the concrete. Item Codes: NDA14112 1/4x 1-1/2 NDA14114 1/4x 1-1/4
