One way to make a table "larger" is to add a leaf, but table leaves have to be stored somewhere. This hardware allows you to have a retractable leaf of 11" or 13 3/4" permanently mounted at each end of the table.
A telescopic extender slides the leaf out from under the table to lock it in place using a spring-activated pop-up mechanism. The base table must be a minimum of 32" long, with a top from 5/8" to 1" thick. Primarily intended for new construction (not retrofitting), as the table must use a modified skirt to accommodate the mechanism.
Requires #8 round-head screws (not included). Sold as two pairs.