The overall dimensions of the heatsink, tolerances and approximate weigth; for any combination may be calculated, based on the following formulae.

Heatsink width A = n x 6
Maximum width tolerance: ± (n x 0.1)
Total weight (Kgrs): (L x n x 0.557) / 1000
L = Heatsink lenght in mm.
n = Number of fins.