Nobody has mentioned that they come in different sizes. Short ones (which seem to be what you have) are for the freezer or kitchen cabinets. Longer ones fit all the way across a fridge shelf. The adjustable end(s) only unscrew about three inches (IIRC) and then fly apart, never to go back together.
The bars can be installed across an opening or up and down, if that is more convenient (On our trailer up and down works best in the cabinet above the television.).
Formerly posting as "littleblackdog"
Martha, Allen, & Blackjack
2006 Chevy 3500 D/A LB SRW, RVND 7710
Previously: 2008 Titanium 30E35SA. Currently no trailer due to age & mobility problems. Very sad!
"Real Jeeps have round headlights"