Daggerz™ Coarse thread Drywall screws are used to attach drywall to wood and are stocked in phosphate, zinc, and yellow zinc. Fine thread Drywall Screws are also available for thin gauge metal requirements in phosphate, or zinc. Most common use is 1-1/8" or 1-1/4" screws for 1/2" board and 1-1/4" or 1-5/8" for 5/8" board. Different lengths of the screws can be used in multi-layer drywall applications.