Our brass drift punch with square to fit most locks to drift the tumbler shank from a flint cock, or percusison hammer. The brass drift is 3-1/2" in overall length, 5/16" in diameter. The end is 0.187" suare by 0.35" long.
All sizes are nominal. Please verify with description for more information.
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Assorted Rifleman's Tools
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Punches