The Rebar Impalement Protection For Rebar #3-#8 (100 pieces/pkg.) with radial gapped top are steel reinforced and conform to State and Federal safety regulations. Approved by California OSHA #C1718AG and OSHA 1723AG Complies with Federal OSHA 701 (b). Federal OSHA has ruled that if cover is in compliance with Cal OSHA, then it conforms to Fed. 701 (b). Made of engineered high-impact plastic. 16 Sq Inches top surface area aids in protection. Fits a range of diameters. Self-centering formed steel insert seats cover perpendicular to rebar