Counterplate XL Hidden Countertop Support - 11-3/4"L; box of 6 XL Counterplates Low-profile plates provide a clean, "floating" look for your kitchen countertop Hot rolled steel with black powder-coated finish for strength and durability - tested up to 500 lbs. Mounts on top of halfwalls to support extended countertop overhangs for "breakfast bar" applications Supports up to a 15 overhang  countertop can extend 6 beyond the support 6 XL CounterPlates for bartops mounted on halfwalls  supports should be spaced every 16 to 20