Helical Insert Helical Insert Type Screw-Locking System of Measurement Inch Overall Length 1/2 in Thread Size 1/4 In.-28 Thread Direction Right Hand Thread Type Fine Material Stainless Steel Material Grade/Class Nitronic 60 Finish Plain Tang Style Tanged Compatible Material Metal Compatible Tap Size 1/4 In.-28 Drill Bit Size G Maximum Hole Diameter Not Applicable Tensile Strength 200 000 psi Outside Diameter 0.316 in Manufacturer Location Made in USA Rockwell Hardness C43-C50