3M Protecta PRO Concrete D-ring Anchor* Bolt to concrete or steel structure to use as a fall arrest anchor point. * The steel plate offers rre drilled 9 16 in. (14. 3mm) holes and has a compact 6" x 6" x 0. 5" (15. 2 x 15. 2 x 1. 3 cm) steel plate * The concrete bolt kit with four 1 2" x 3 3 4" (1. 3 x 9. 5cm) bolts is included. * Utilizes a steel D ring as a compatible tie off point. * The high strength steel construction is extremely rugged and has a corrosion resistant powder coating.