Dimensions MaterialCarbon Steel Amount of Clins4 Internal thread1/4-20 External thread1/2-13 Shear Engagementcontact us IN2 Length (L)0.37 Locking Depth (Z)n/a Installation Dimensions Tap Drill D10.453 Countersink D30.51 Thread D21/2-13 Min. Depth T0.44 Removal Dimensions Drill Diameter13/32 Drill Depthn/a Keenserts ® is a registered brand name from Note: This Clinserts ® 73043 is also available in starter kit with installation tool and refill kit