Product details:

Converts dinettes to berths. 9" diameter cast aluminum base on each end for support. Locks any height from 14.5" to 30.75". Smooth 2.875" stanchion tube. In lower position, inside tube goes below deck 6".Converts dinettes to berths
Precision stanchion tubing is pressed securely to cast aluminum base on each end
In lower position, inside tube goes below deck 6"
Castings have six 1/4" holes for mounting