... M6-M20 3.Surface:Zinc Plated 4.Timely delively,secure 3pcs heavy duty anchor → It is made of steel ... is pulled into the anchor shells expanding it .1)Metal anchor for medium-heavy duty For use on ... facilitate centring the screw 3)APPLICATIONS For heavy fastenings to be inserted flush with the ... concrete, solid brick, stone and compact materials. 4)Electrical sector, dusts in sheds, fixing brackets. ...