Islandbar Hidden Countertop Support - 24"L; box of 3 Islandbars Low-profile plates provide a clean, "floating" look for your kitchen countertop Hot rolled, 7 gauge steel with black powder-coated finish for strength and durability -tested up to 500 lbs Mounts on cabinetry to support extended countertop overhangs for Island and Peninsula style applications Supports up to a 18 overhang  countertop can extend 6 beyond the support 3 Island Bars for overhangs on top of cabinetry  supports should be placed every 16 to 20