Countersunk Flat Head coarse thread wood screws. Nibs located on underside of the head help prevent spin out and allow the screws to self-countersink for a flush installation. Type 17 auger style point eliminates pre-drilling and enables a smooth easy penetration of the coarse threaded screw into hard woods. Square drive provides a more positive and stable driving system. Lubricized finish reduces friction and aids penetration with reduced effort and torque. Sold 3500 pieces per case.