HP8F-DT20-36-QS, Lockbolt Break-Pins (Unified), Huck, HP8 PowerBolt Lockbolts, Style : 63253, Grade : 8, Fractional Diameter : 5/8 Inch, Body Material : Steel, Material Detail : Medium Carbon Steel, Finish Detail : Plain, Underhead Length to Breakpoint : 3.570 Inch (90.68mm);, Drill Size : 5/8 Inch