Self-Locking Insert Kit System of Measurement Inch Insert Diameter 5/16 in 3/8 in 7/16 in 1/2 in 5/8 in Internal Thread Size #10-24 1/2 In.-13 1/4 In.-20 3/8 In.-16 5/16 In.-18 Thread Direction Right Hand Thread Type Coarse Overall Length 5/16 in 3/8 in 7/16 in 1/2 in 5/8 in Number of Pieces 56 Number of Sizes 5 Material Stainless Steel Material Grade/Class 18-8 Finish Plain Wall Type Thin Wall Compatible Material Metal Manufacturer Location Made in USA