Recoil Heavy-Duty Key Locking Insert, Style: Locking, Unit of Measure: Inch, 1-1/2-12 Internal Thread, 3B Internal Thread Class, 1-7/8-12 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, 2 Inch Body Length, Recommended Installation BA-70242, Tap Drill Size: 1-13/16 Inch, 1.89 Inch Counter Sink Diameter, 1-7/8-12 Thread Tap Size, 2B Thread Tap Class, 2.28 Inch Min Thread Tap Depth, 1-23/32 Inch Removal Drill Size, 5/16 Inch Removal Drill Depth