Formwork Head Strike Anchors (aka the proprietary name Spike Anchor) is a single piece, hammer in anchor for use in solid base materials such as concrete, brick, block, stone and other masonry. The S shaped kink in the Strike Anchor generates expansion forces once the anchor has been hammered into the pre-drilled hole. This anchor is a fast and economical way to fix steel brackets and timber structures to solid base materials, and the special formwork head allows the anchor to be removed for temporary fixtures. Strike Anchors are manufactured pre-expanded and simply require setting with a hammer, without the need for secondary tightening for installation, making it a common choice for fast installation applications.