
The Manfrotto 208 HEX is an adapter / hex spigot compatible with Super Clamps (e.g. Manfrotto 035 Super Clamp). The adapter has a Hexagonal Stud, so it does not rotate in the Super Clamp, but stands firmly in place.
The adapter has a 3/8' male thread on top. This allows you to attach a Manfrotto ball head to the 035C Super Clamp, for example. All Manfrotto camera and video heads can be attached to the 3/8' male thread.