Recoil Thin Wall Key Locking Insert, Style: Locking, Unit of Measure: Inch, 5/16-18 Internal Thread, 3B Internal Thread Class, 7/16-14 External Thread, 2A External Thread Class, Body Material Detail: C1215 Steel with 302 Stainless Steel Keys Material, Finish Detail: Zinc Phosphate and Ferrocote 364-3 Oil, 0.43 Inch Body Length,Recommended Installation BA- 72312, Tap Drill Size: X, 0.44 Inch Counter Sink Diameter, 7/16-14 Thread Tap Size, 2B Thread Tap Class, 0.50 Inch Min Thread Tap Depth, 11/32 Inch Removal Drill Size, 3/16 Inch Removal Drill Depth