This RAM MOUNTS 1' Track Ball with T-Bolt Attachment is designed to slide into most track systems. It is composed of a 'B-size' 1' rubber ball molded to a composite base, a rubber friction washer, and a stainless steel 0.48 x 0.95' T-bolt. Twist the ball clockwise to tighten it into place. The ball can be used with other RAM MOUNTS components.