Zinc Coated Screws. 1/4" Hex Heads. 1/2" Sharp tip screws. Perfect for gutters, downspouts, copper flashing, or sheet metal use Self piercing tip cuts through thin sheet metal without pre-drilling 1/4" Hex Bit Driver Included #8 x 1/2" Sheet Metal Screws feature a Sharp Tip for self-drilling into metal and wood. This screw features a 1/4" Hex Head and each order includes a 1/4" Hex Bit Driver to make application quicker and easier.