An anchor system securable to a work-piece comprising: an anchor portion including a tubular member extending from an anchor head, the tubular member including a wall defining a first interior surface and a second interior surface having an enlarged diameter with respect to the first interior surface, at least a portion of at least one of the first and second interior surfaces including threads; a support portion including a base portion and a shaft portion extending from a central portion of the base portion, the support portion further including a through passage; and a fastener including a drive end and a fastening end; characterised in that the shaft portion includes a first exterior surface and a second exterior surface of a greater diameter than the first exterior surface and wherein the anchor system is configured such that in a first pre-set configuration in use a distal end of the shaft portion is received by the tubular member and the fastener is disposed in the through passage such that the drive end thereof extends from the distal end of the shaft portion by a predetermined distance when the fastening end engages the work-piece and wherein the system can transition between the first pre-set configuration and a second set configuration by applying an impact force to the anchor head of the anchor portion for causing the interior surfaces of the anchor portion to telescopically slide longitudinally along the corresponding exterior surfaces of the shaft portion, a lower portion of the anchor head contacting the drive end of the fastener to drive the fastener during such telescopic movement so as to extend the fastening end into the work-piece, said telescopic movement including sufficient interaction between the second interior and second exterior surfaces to prevent passage of concrete to the second interior surface in the set configuration. an anchor portion including a tubular member extending from an anchor head, the tubular member including a wall defining a first interior surface and a second interior surface having an enlarged diameter with respect to the first interior surface, at least a portion of at least one of the first and second interior surfaces including threads; a support portion including a base portion and a shaft portion extending from a central portion of the base portion, the support portion further including a through passage; and a fastener including a drive end and a fastening end; characterised in that the shaft portion includes a first exterior surface and a second exterior surface of a greater diameter than the first exterior surface and wherein the anchor system is configured such that in a first pre-set configuration in use a distal end of the shaft portion is received by the tubular member and the fastener is disposed in the through passage such that the drive end thereof extends from the distal end of the shaft portion by a predetermined distance when the fastening end engages the work-piece and wherein the system can transition between the first pre-set configuration and a second set configuration by applying an impact force to the anchor head of the anchor portion for causing the interior surfaces of the anchor portion to telescopically slide longitudinally along the corresponding exterior surfaces of the shaft portion, a lower portion of the anchor head contacting the drive end of the fastener to drive the fastener during such telescopic movement so as to extend the fastening end into the work-piece, said telescopic movement including sufficient interaction between the second interior and second exterior surfaces to prevent passage of concrete to the second interior surface in the set configuration.