CounterPlate Hidden Countertop Support Plate - 9-3/4"L Supports up to a 13 overhang Hot rolled, 7 gauge steel with black powder-coated finish for strength and durability -tested up to 500 lbs Mounts on top of half walls to support extended countertop overhangs for breakfast bar style applications - countertop can extend 6 beyond the support Low-profile plates provide a clean, floating look for your kitchen countertop CounterPlate for bartops mounted on halfwalls  supports should be spaced every 16 to 20