PArametric Shim

Hello,
I print a shim for a friend, and so µI develop a parametric model which allow to add some grove.
Just use it, ans tell me if you have some question or upgrade.
The parameters are (refer to the pictures) :
// Description parameter
Ext_Dia = 77; // External diameter
Thickness = 20; // Height of the shim
Hole = 55; // Internal diameter
Grove_Width = 20; // Grove Width
Grove_Depth = 6; //Grove Depth
Grove_Number = 3; // Number of grove equaly space