More efficient code

[gubbedelux]

Could this code be written in a more efficient way

If diam = 16 And stign = 0.5 Then mdimmax = 15.655
If diam = 16 And stign = 0.5 Then mdimmin = 15.565

If stign = 0.5 Then mattradsdiameter = 0.3
If stign = 0.5 Then tillagsmatt = 0.467