Self-Locking Insert Kit System of Measurement Inch Insert Diameter Not Applicable Internal Thread Size #1-8 1/2 In.-13 3/4 In.-10 5/8 In.-11 Thread Direction Right Hand Thread Type Coarse Overall Length 21/32 in 11/16 in 25/32 in 1 1/4 in Number of Pieces 22 Number of Sizes 4 Material Steel Material Grade/Class 12L14 Finish Plain Wall Type Heavy Wall Compatible Material Metal Manufacturer Location Made in USA Drive Type Slotted