This is a listing for 2 phot r c clamps this phot r c clamp with spring clip holder has many different applications within the studio the c clamp can be attached to light stands crossbars autopoles or a shooting table with the aid of a sturdy screw coupling mechanism the metal framed clips holder is has strong spring built inside ideally suitable for collapsible reflectors backdrops and other small studio accessories this c clamp can lock on most of light stand tripod and tubes up