The Barber low height Bonnell Innerspring Units are manufactured in uniform finished heights ranging from 2-3/4" to 4-1/2".
The springs in this unit are run, heat-tempered, and laced at the precise required height, so that they are even and flat with a uniform carrying capacity.
The units are designed to fold and unfold consistently at the proper point.
These low height Bonnell Units are used in sofa-sleepers, futons, and baby beds, and are available in different sizes and coil counts in #13 gauge and #13-1/2 gauge wire.