There are 3 sizes to choose from:
H2000*L900*W400 5-tier single-sided (normally to put against the wall for more storage);
H1500*L900*W400 4-tier single sided (normall to put on on side or both side of the end of double-sides shelvings);
H1500*L900*W400 4-tier double-sided;
You may put more or less shelves as needed, optional draw bars and hooks, wire baskets are also available.