Foto&Tech Heavy Duty Muslin Clamps 10-pack Set of 4.5 inch for Photography Photo Studio Backdrops/backgrounds/Photo Paper/ Light Reflector (10 Pack) Thick-walled reinforced nylon construction - built to last Solid steel pivot and tempered spring for years of use 4.5 cm mouth opening maximum Adjustable mouth pad fit universal size Designed one hole on each handle, connect to studio support system stand easily