NOTE: When you order Workrite Sierra Desks with Silhouette Tops only, the Tops are predrilled for installing on the Base and you do not need to order Drill Kit and Screw Pack separately but for any accessories like CPU's and Keyboard Trays, since we do not know the locations the customer would want to install them under the Top, so you need the optional Drill Kit and Screw Pack separately.

Workrite 4400303 Silhouette Drill Kit