White subframe. Cannot be Used Alone. Expand The Modular Capability of The Bookshelf Without The Cost of Another Full Bookshelf Unit. (White)

Omega 14" Deep x 42" Wide x 96" High 3 Tier Freezer Starter Shelving Unit

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Mystic Oak

Giantex 4-Cube Bookcase, Stackable Cube Storage Organizer w/Open Bookshelf, Wooden Display Shelving Unit for Small Space, DIY Modular Cubby Storage System for Home, Study, Rustic Brown

Omega 30" Deep x 60" Wide x 36" High 3 Tier Black Starter Shelving Unit

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Chalked Chestnut

Metal Grid 14"x14" Wire Cube Storage - 30 - Cube Modular Shelving Unit, Stackable Bookcase for Office, Bedroom & Living Room

Omega 18" Deep x 60" Wide x 86" High 3 Tier Black Starter Shelving Unit

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Sindoori Mango

20 - Cube Organizer: Wire Cube Storage for Home & Office - Multifunctional, Modular Cubbies

Omega 21" Deep x 72" Wide x 86" High 3 Tier Chrome Starter Shelving Unit

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Laurel Oak

Omega 21" Deep x 60" Wide x 86" High 3 Tier Black Starter Shelving Unit

CAPHAUS Sturdy Room 13-Inch Cube Storage Organizer Shelf, with Extra Thick Exterior Edge, Open Storage Shelf Divider, Bookcase, 6-Cube / 8-Cube / 9-Cube, Colors Available in Rustic Grey Oak and White

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Vintage Oak

Omega 12" Deep x 30" Wide x 54" High 3 Tier Gray Starter Shelving Unit

CAPHAUS Sturdy Room 13-Inch Cube Storage Organizer Shelf, with Extra Thick Exterior Edge, Open Storage Shelf Divider, Bookcase, 6-Cube / 8-Cube / 9-Cube, Colors Available in Rustic Grey Oak and White

Omega 36" Deep x 60" Wide x 80" High 3 Tier Freezer Starter Shelving Unit

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Pacific Maple

CAPHAUS Sturdy Room 13-Inch Cube Storage Organizer Shelf, with Extra Thick Exterior Edge, Open Storage Shelf Divider, Bookcase, 6/8/9 Cube, Colors Available in Rustic Grey Oak and White

Omega 36" Deep x 36" Wide x 86" High 3 Tier Freezer Starter Shelving Unit

Sauder 5 Tier Book Shelf Wooden Bookcase Multipurpose Bookshelf for Home Office, Living Room, in Salt Oak finish

CAPHAUS Sturdy Room 13-Inch Cube Storage Organizer Shelf, with Extra Thick Exterior Edge, Open Storage Shelf Divider, Bookcase, 6-Cube / 8-Cube / 9-Cube, Colors Available in Rustic Grey Oak and White