Monadnock 21" Expandable Control Device This is the most compact design allowing for convenience of wear and ease of concealment with a lower profile. These light and easy to carry batons expand and collapse with a positive lock system, providing strong anatomical subject compliance. The Monadnock Control Device is a two stage positive lock baton with a trumble stop side handle fastened to a one inch diameter aluminum frame which has a black anodized finish. An expanding epoxy reinforced shaft is positively locked into position ensuring that the baton will not inadvertently close.