High Strength Alloy screws must be used.Both UNC and Coil available.Swivel 360 and pivots 180.Direct mounting.Wide round base helps distribute shear loads.Aircraft Quality "Chrome Moly" and Heat-Treated.Magnetic Particle Inspected.Rated load capacities from 2500 lbs. to 20000 lbs.Many OEM applications.Perfect for pre-cast concrete products : simply cast a threaded anchor or stud into the concrete part. Mount the hoist ring and you have an easy, safe lifting handling application.Safety Factor : 5:1.Note :Thread engagement should be 1 12 times the diameter of the equivalent of Grade 8 Alloy Screw.