No. 4 x 1/2" Twin Woodscrew PZ1 RND - BZP (Box of 200) 00412CRWZ Timco

Double countersunk hardened twin threaded wood screws plated in Zinc.
Pozi recess for reduced cam out and round head for reliable clamping.
60° Twin-threads with parallel shank for faster insertion and greater pull out resistance.
Partially threaded from 1 1/4".
25° sharp point and single leading thread achieves a fast start and improved thread acceptance.