MaterialSteelPurposeUsed with drivmatic riveter G-39A and G-400 with adapter ST1016-A-2 to drill and countersink 100° holes in production partsUsed WithST1016-A-2, G-39A, G-459TypeDrill/CountersinkDrill Size (in)0.164Rivet Size (in)5/32Drill Length (in)1/2