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@Chocky
Only if you cut it diagonally. If you cut it square on then it's 18mm the whole way down, unlike a circular cross section which starts off thin and reaches 18mm at the widest point. If effort is a function of the total amount of metal you have to abrade, then your lock is 27% more demanding than an 18mm diameter circular cross section: 18mm squared for yours, versus pi * 9mm squared for a circular lock.