The Kirk ASC-3 Snap Collar for BH-3 Ball Head is a low-cost protection accessory for those that like to keep their camera and lens attached to the tripod while moving around. The collar simply slips over the exposed part of the ball, creating a block to the ball and preventing the ball from flopping to the side. It also helps to avoid undue stress on the locking mechanism, helping your ball head to perform and last longer.