Decking screws square drive for reduced cam-out / cutting point eliminates pre-drilling / ribbed head for flush finish / use no2 square drive bit The low-profile, trim-style head sits flush with the surface, delivering a clean finish. A Type-17 point allows for quick starts, while coarse threads on the lower two-thirds of the shank provide powerful pull-through—drawing deck boards tightly to the joints for a secure hold.