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21 nails is about one-fifteenth as long as a Bowling Lane.
In other words, it's 0.062651 times the length of a Bowling Lane, and the length of a Bowling Lane is 15.9610 times that amount.
(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 335.190 nails. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
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