Concrete D Ring Anchors, 3", Swivel DRing, for 11 16", 18 mm, 3 4" Concrete Hole ORS NASCO keys and springs Made in USA keys and springs Made in USA Just add water Towel temperature drops 15 to 20 degrees in 1 to 2 min Once activated this product assists in lowering temperature Absorbs up to 12 times its dry weight Reusable 000 psi concrete Provides cadmium plated D ring for connection to fall arrest lanyard or lifeline and special red sheering bolt that falls off to expose a green bolt when proper torque is reached Removable and partial reusable This simple to use concrete anchor is designed to be set into holes drilled in 3