When we measure the 3D model in Catia V5 for its overall dimensions as LXBXH, as 400mmX200mmX130mm as shown in image above.

When we create the Bounding Box value in Catia V5 for the same 3D model the values it is showing as 400.069mm, 200.165mm and 130.084mm as shown in below image. I just wanted to know why there is an additional decimal values that are coming in bounding box values? Can anyone help me for this question? Thank you.