Helical Inserts are precision formed screw thread coils of stainless steel. Helical inserts have a diamond shaped cross section. Helical inserts provide permanent conventional 60degrees internal screw threads that accommodate any standard bolt or screw.FeaturesType - Free Running.Material - 304 Stainless Steel.Internal Thread Size - 1/2 x 13.Thread Type - UNC.Thread Direction - Right Hand.Length - 0.75 in.Free Coil Size - 0.593-0.622 in. Dia.Drill Size - 33/64 in.Tensile Strength - 200,000 PSI.Rockwell Hardness - C43-C50.Application - For Metal.Package Quantity - 10.Body Style - Helical.Exterior Finish - Plain.