Dimensions MaterialCarbon Steel Amount of Clins4 Internal thread _ External thread _ Shear Engagementcontact us IN2 Length (L)1.37 Locking Depth (Z)n/a Installation Dimensions Tap Drill D11437 Countersink D31520 Thread D21-1/2-12 Min. Depth T1.56 Removal Dimensions Drill Diameter11/32 Drill Depthn/a Keenserts ® is a registered brand name from Note: This Clinserts ® 74163 is also available in starter kit with installation tool and refill kit