HP8F-DT20-8D1-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 : Geomet 321, Two Coats, Underhead Length to Breakpoint : 1.820 Inch (46.23mm);, Drill Size : 5/8 Inch