Hallowell Features: -Add-on unit. -Hi-Tech Shelving collection. -725 Hallowell Gray color. -Material: Steel. -Available in several sizes. -Heavy-duty. -Open type with sway braces. -With 5 adjustable shelves. -Made in the USA. Specifications: -Dimensions: 87" H x 36" W x 12" D. -Dimensions: 87" H x 36" W x 18" D. -Dimensions: 87" H x 36" W x 24" D. -Dimensions: 87" H x 48" W x 12" D. -Dimensions: 87" H x 48" W x 18" D. -Dimensions: 87" H x 48" W x 24" D. A510 Size: 87" H x 48" W x 18" D