The part is simply plugged together - and keeps stable only by the tension by hooked the baskets. The rollers run well. This part fits with me under the dining table in the kitchen and takes away any extra space. The edges of the baskets is one strain not particularly, but otherwise the part appears solid - and again a few parts are cleaned up, which tend otherwise to stand around. In width and length to fit in a basket 5 Tetrapack a 1 L milk, etc. The inside width from 1 to 2 and 3 basket is around. 14 cm.