Countersunk Ribbed green screws 2 1/2" #8 wood screws Flat head with self-countersinking with nibs gives a flush, clean and attractive countersink that locks the screw in tight. Deep coarse thread configuration ensures low-torque installation with exceptional draw-down for maximum holding power. Type 17 slash point . Popular size:green screws 2 1/2" #8 wood screws 4.5 x 50mm, 4.5 x 65mm , 4.5 x 75mm Features and benefits Proprietary corrosion resistant 1,000 hour salt spray resistance. Green coating for all-weather outdoor applications . Suitable for both internal and external applications . Free square drive bit in every box.