Fits in my drawer front and back with a margin in millimeters which means 0 wasted space. What I love most about it is that I can store all my 6mm to 27mm wrenches in a row, unlike cheap plastic 16 slot wrench holders. I will also order one of these for my standard keys. Other thoughts - I wish they would do one of these with the cones in the opposite direction for even more efficient use of my wrench box.