fig1 12 as shown the back panels may include a fixed panel 72 and a movable panel 73 see fig1 for affixing respectively in the one or more rigid metal side framing parts 74 75 the back panels allow for a non opaque window in the back of the unit for product visibility the easl 12 has side panels 80 82 each side panel configured to affix onto a respective rigid metal side framing part 50 52 which are shown in more detail in fig5 in the easl 12 the rigid metal side framing parts 50 52 are configured with openings 50 a to receive front and back stacking pins not shown for stacking merchandisers one on top of another the rigid metal side framing parts 50 52 includes one or more tabs 50 b to permanently mount the expandable adjustable stackable and lightable counter merchandiser 12 to a surface each shelf 54 56 58 60 may also include a joiner tube 60 e configured for providing additional support in center bolts to side frame which is shown in more detail in fig4 c 1 4 c 2 4 c 3 the shelf support 60 a 60 a u2032 may also include a cross member 60 f coupled between the shelf legs 60 b 60 b u2032 the snap on shelf 60 d may also include lower flexible tabs 71 configured to hold undermount lighting unit not shown between the shelf.