Each piece measures 7/16 x 7/16 x 24" (10mm x 10mm x 609mm)
This molding has a 3/16" wide groove that fits the "siding" that Dura Craft used to make their older model dollhouses such as the Cambridge, Victorian Masion, Haritage, and Farmhouse.
The 3/16" groove (4.5mm) also fits 1/4" plywood or 3/16" MDF.