Aerosmith’s Double Expansion Anchors can be used in solid concrete, brick block and stone. The double expansion heavy duty mechanical anchor is made of die cast Zamac alloy and is corrosive resistant. Although the product can be used in many base materials it is sometimes used in questionable materials because it expands against the concrete at two points. Sizes are available from 1/4” to 3/4” diameters. Drill the proper diameter hole to the specified embedment, tap anchor into pre-drill hole until flush. Put fixture in place and insert machine bolt. Tighten to required torque to properly set the anchor. This product is not recommended for overhead applications.