Helicoil R1191-10 5/8-18 Inserts - 6/Pkg Price For: Each Meets/Exceeds: - Thread Type: UNF Rockwell Hardness: C43-C50 Item: Helical Insert Thread Direction: Right Hand Application: For Metal Type: Free Running Helical Tensile Strength (PSI): 200, 000 to 250, 000 Free Coil Dia.: 0.746" Tap Sizes: 5/8-18 STI Internal Thread Size: 5/8-18 Drill Size: 41/64" Material: 304 Stainless Steel Length: 0.938" Country of Origin (subject to change): United States