Polylok OSHA Rebar Safety Cap Description Polylok’s OSHA rebar safety caps provide the protection you need from protruding rebar at your construction sites. They can be used to protect employees and equipment from exposed rebar, pipe, and anchor bolts. These high-quality caps are a high visability orange color for excellent visibility, and fit #3 - #8 rebar. Protective rebar caps are of use where the danger of impalement is present.