Dimension slots

Finding center or midpoint of a slot dimension a slot Geometry of the bracket slot plays a major role in efficient three−dimensional tooth movement during the orthodontic treatment Materials and methodology: dimension a slot For the slot, I would just like to know how to dimension the length of the slot When I select the two cylindrical ends, the dimension goes to

dimensioning a slot The length : This has a feature size tolerance of ± mm and a position tolerance of mm at MMC with respect to datum