Base 412 Call For Quote $1.43 Interior Base MDF, 5/8″ x 4-1/4″ View Product Catalog Base 412 quantity Add to list Want a discount? Become a member. SKU: 412 Category: Mouldings Description Description Traditional base MDF412 – MDF, 5/8″ x 4-1/4″ available in 16′ lengths OWS does NOT recommend installing MDF in areas prone to moisture (bathrooms, basements)