Acorn SW-MW15BK250 Metal Building Screw, 1.5", BlackHighlights: Length : 1 1 2" Count : 250 Color : Black #9 Gauge. 1 4" H Hex type head with Hi Lo type thread 1 2" neoprene sealing washer provides a moisture resistant barrier when properly installed Plated with top quality dacromate, for corrosion resistance Type 17 extra sharp point increases penetration of the metal virtually eliminating the tip of the screw walking across the metal WARNING: This product can expose you to chemicals including Nickel