Self-Locking Insert Kit, System of Measurement Inch/Metric, Insert Diameter Not Applicable, Internal Thread Size #10-32, 1/2 In. -20, 1/4 In. -28, 3/8 In. -24, 5/16 In. -24, Thread Direction Right Hand, Thread Type UNC Internal/Metric External, Overall Length 31/64 in, 43/64 in, Number of Pieces 44, Number of Sizes 5, Material Steel, Material Grade/Class 12L14, Finish Plain, Wall Type Heavy Wall, Compatible Material Metal, Manufacturer Location Made in USA, Drive Type Slotted. This item has been restricted from sale in the following state (s): []