Single adjustable,three prongs are covered with rubber tube.

1.Use to Hold a Clamp on Retort Stand in Labs.
2.High Quality: Strong Die-casting Aluminium and Iron Screw Thread.
3.Blue and Black, Spray Finishing

1.An iron ring is an item of laboratory equipment which comprises a
conjoined metal ring and radially-extending rod.
2.It is commonly used in chemistry laboratories for supporting
apparatus above the work surface.