Hybrid Bracket - Hidden Countertop Support (12", Black) Low-profile brackets provide a clean, floating look for your countertop Hot rolled steel with powdercoated finish for strength and durability; 1,800 lbs - 7,960 lbs per set Surface mount installation Available with 12, 18 , and 24 arms - countertop can extend up to 6 beyond the support Supports should be placed every 16 to 20