Expansion Type (Wedge Anchor, Sleeve Anchor and Drop-in): tension loads are transferred to the base material (concrete or block) through a portion of the anchor that is expanded inside the drill hole.

Adhesive Type: resistance to tension loads is provided by the presence of an adhesive between the threaded rod (or rebar) and the inside walls of the drill hole.

Friction Type (Hammer-Sets, Nail Drive and Forming Spikes): load capacity is created by driving a fastener into a pre- drilled hole (in concrete, block or brick) that is slightly smaller than the fastener itself.

Mechanical Interlocking Type (Screw Type Anchors): tension loads are resisted by threads on the fastener engaging with threads cut into the base material (concrete, block or brick).

Keying Type (Umbrellas, Inserts and Screens): holding strength comes from a portion of an anchor that is expanded into a hollow space in a base material that contains voids such as concrete block or brick.

Anchor drill holes are typically produced in concrete by using carbide tipped drill bits and rotary hammer drills. Follow manufacturer's instructions for the correct drill- hole diameter and depth of each type of anchoring system.

Careful cleaning of the anchor drill hole is important in order to obtain the best possible functioning of the anchor system. Carefully read each product's installation instructions.