Ideal for use as Brood chambers in your hive. Standard use is two brood chambers per hive. Based on the Langstroth 10-frame design with standard 9-1/2 in frames made from USA Ponderosa Pine with minimal knots, grade 2 or better, this box works with any Langstroth hive. Handle grips on four sides facilitate easy handling. Frame rest included. Recommend assembly shortly after delivery to ensure product quality. Dimension of 16-1/4 x 19-7/8 x 9-1/2 in. Assembly required and assembly instructions are enclosed.