The compact depth guide and dust port adapter are two additional attachments for the Trio tool. The dust port adapter lets you attach a vacuum hose to the Trio to clean up any debris or Woodrazor® that may be made during the process of using the Trio. It’s a convenient way to stay efficient and clean up. The compact depth guide can be attached to the Trio in order to work in tight spaces. It creates an easy way to manage detail work. Both of these attachments are used for separate purposes but sold together.