Grip-Rite 214STHDW1 #6 x 2-1/4 in. Phosphate Coated Square Drive Flat Undercut Trim Head Drywall Screws provide a strong and reliable hold for trim and finishing applications. With a square drive for quick engagement and a sharp point for faster starts, these screws have a small head for easier coverage. Fine threads make them ideal for driving into metal or wood substrates.