OSHA compliant meets ANSI Z359.7 standard. Temporary Concrete Anchor Hole Size Opening / Install Thru / In: 3/4 (19 mm). Ease of Use simply drill the proper size hole into the concrete, blow the dust out with compressed air, and insert the unit. Multi-Directional Attributes removable anchor works in horizontal, vertical and overhead surfaces. Reusability when your job is done, simply fill in the drill hole and reuse at your new desired location.