C50LR-BR16-8G-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 : Zinc Electroplated, Clear Trivalent Chromate, ASTM B-633, Underhead Length to Breakpoint : 1.463 Inch (37.16mm), Drill Size : 37/64 Inch