The Parawedge anchor stud is cold formed and consists of a threaded section with standard coarse bolt threads at 1 end, and a parabolic mandrel at the opposite end for a smoother expansion. It has a 360 Deg one-piece clip that functions as a 2-piece clip for more contact, a torque controlled expansion, and can be installed into a bottomless hole. 3 head styles are available: Hex Nut, Wire Hanger and Tie Down Hook. More than 39 sizes are available, in 2 types of material: Carbon steel and 304 Stainless steel. Approvals: UL. Underwriters Laboratory – File #EX 4687.Parabolic mandrel for a smoother expansion360 Deg 1-piece clip that functions as a 2-piece clipCan be installed into bottomless holeCold formed for increased strengthDrill an appropriate size hole into base materialClean hole using a dust blower or compressed airInsert the nut with a clearance of 1/8 in. to the top of the anchorWith a hammer or light mass, insert the anchor into the holeRemove the nut and insert the object to be installedUsing a wrench, tighten the nut by turning clockwise until there is a strong resistance. 2 to 3 turns will fully set the anchor. This product can expose you to chemicals including nickel, lead, which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.