Recoil Thin Wall Key Locking Insert, Style: Locking, Unit of Measure: Metric, M8 x 1.25 Internal Thread, 6H Internal Thread Class, 1/2-13 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,Recommended Installation BA- 70084, Tap Drill Size: 29/64 mm, 1/2-13 Thread Tap Size, 2B Thread Tap Class, 13/32 mm Removal Drill Size