10" Knee Wall Hidden Granite Bracket Countertop Support Bracket steel one - (Choice of Length)" x 2.5" x 1/2" American Steel Bracket Screw holes are countersunk for a flush installation. Hole diameter 1/4" Bracket end has beveled edge for safety Economical way to protect countertop investment. Non-intrusive. No corbels needed. No knee knocking Strongest on the Market. Made in USA. Limited Lifetime Warranty**