C50LR-BR16-24-QS, Lockbolt Break-Pins (Unified), Huck, C50L Lockbolts, Style : 63253, Grade : 5, Fractional Diameter : 1/2 Inch, Head Capped : No, Body Material : Steel, Material Detail : Medium Carbon Steel, Finish Detail : Plain, Underhead Length to Breakpoint : 2.463 Inch (62.56mm), Drill Size : 37/64 Inch