Narrow Variera Shelf Insert / Divider made of Durable Metal.
Dimensions: 32 W x 13 D x 16 H cm.
Another firm favourite for us - these shelf inserts are really useful in your kitchen cupboards to maximise the height space available for mugs, glasses, plates and food. This is also stackable on top of the wider shelf insert. It makes it is easy to see what you have and to get items out.
NB: this does need a screwdriver as there are screws which attach the legs (the holes may feel tight but the screws do go in with a bit of force). If you don't want any self-assembly, try the iDesign shelf inserts instead.
Another note - these boxes are made by Ikea so you can buy them direct from there for a cheaper price but if you can't get there or need them quickly these are the same shelves but available on Amazon.
Buy From Amazon