Here's the easy way to add a convenient shelf unit to your SQUARE-LOK set-up. The 9x9" Shelf locks into SQUARE-LOK panels via integrated hooks and expanding nut grommets, and can support up to 25 lbs. Compatible with SQUARE-LOK panels (sold separately) Locks into SQUARE-LOK panels with integrated hooks and expanding nut grommets Measures 9x9" Holds up to 25 lbs. when evenly distributed Order today!