Summary DIMESIONS: 40mmx18mm What does it do you ask? Very simple. It holds those tiny finishing nails they give you to attach the back board to many of their pieces of furniture such as bookcases, cabinets and wardrobes. No more hitting your fingers with the hammer. No more crooked nails breaking through the back of the bookcase in the wrong spot. Perfect every time. Thank you Ikea! from this article: http://scottboms.com/2006/09/gadget/ SHARE if you like it .... thanks find more about my design: http://www.thingiverse.com/3Dstreaming/designs