Dimensions Material4140 alloy steel Cadmium plate Amount of Clins2 Internal thread1/4-28 External thread1/2-20 Shear Engagement0.252 Length (L)0.4 Locking Depth (Z)n/a Installation Dimensions Tap Drill D10.468 Countersink D30.51 Thread D21/2-20 Min. Depth T0.39 Removal Dimensions Drill Diameter13/32 Drill Depth5/32 Note: This Clinserts ® CLFL428J is also available in starter kit with installation tool and refill kit