Specially designed screws for attaching Durock cement board to wood framing. Corrosion- and has wafer heads with ribs to prevent strip out. 1-1/4" long screws are used for applying 5/16" Durock underlayment or 1/4", 1/2", and 5/8" Durock cement board to subfloors and countertops or 1/4" and 1/2" Durock cement board to walls. 200 screws per package. Proposition 65 Warning. Proposition 65 requires us to inform the user of these products to use gloves when installing these products it is also suggested to wash your hands throughly after using this product. The zinc used in the coating process contains chemicals known to the state of California to cause cancer and birth defects or other reproductive harm. -