The adjustable spring ring design can expand the diameter of the pen holder, just fix the clip on the thin cover notebooks, clipboards, and calendars to keep your pens in place
Material: Low carbon steel, manganese sheet
Color: Black
Product size: Length 3.2cm/1.26in, Width 1.5cm/0.59in, Height 1.25cm/0.49in
Packing list: 5 Spring adjustable pen holder for clipboard