Recoil Heavy-Duty Key Locking Insert, Style: Locking, Unit of Measure: Inch, 7/8-14 Internal Thread, 3B Internal Thread Class, 1-1/4-12 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, 1.25 Inch Body Length, Recommended Installation BA-72875, Tap Drill Size: 1-3/16 Inch, 1.27 Inch Counter Sink Diameter, 1-1/4-12 Thread Tap Size, 2B Thread Tap Class, 1.44 Inch Min Thread Tap Depth, 1-3/32 Inch Removal Drill Size, 5/16 Inch Removal Drill Depth