I ordered a set but these tools are not really needed for their intended purpose. If you have locks and guides you can use the locks themselves as a template and do not need a drill extension or collar. Very well thought out and high quality tool set. Great for a furniture store and when you don't actually stock locks, but are too expensive and impractical for smaller projects (e.g. less than 20-30 sets of drawers or less). You can use Blum drawer locks and a stamp as a template and you will receive a custom-fit lock set (not required for the drawer slides themselves).