Has a sizable shoulder under the head to lock the screw in and prevent it from staying pulled by means of the fabric The duration of these screws may differ, but most drywall screws have flat heads that are made to countersink slightly below the surface area of your drywall. https://wood-screws05813.thenerdsblog.com/34222776/how-screws-can-save-you-time-stress-and-money