Look at our "Wrestling Season Special" in the Exercise of the Month section for an example of how to use the single handle version of this collar. This product is similar, except that two handles must be attached, one for each hand.
This is a collar that slips onto your grappler's Olympic bar, before the weights are placed onto the bar, that allows a pair of any kind of handles to be attached via a carabiner. There are two lengths of chain, each about 5 inches long, welded to the collar. As an example, you can use this collar to do T-bar style rowing motions with two pinch grip handles, or two spherical handles, for hand strength development.