C30C-BR20-12GASS-QS, Lockbolt Break-Pins (Unified), Huck, C50L Lockbolts, Style : 63253, Grade : 5, Fractional Diameter : 5/8 Inch, Head Capped : Yes, Head Cap Material : Stainless Steel, Body Material : Steel, Material Detail : Medium Carbon Steel, Finish Detail : Zinc Electroplated, Clear Trivalent Chromate, ASTM B-633, 0.0004 Inch, Underhead Length to Breakpoint : 1.933 Inch (49.10mm), Drill Size : 11/16 Inch