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