For overall woodworking and other wooden to wood applications Yellow zinc is cosmetically appealing for total wood work Coarse Threaded Phillips Drive Drywall Screws feature horizontal indentations that assist to securely fasten gypsum (drywall) boards to wood studs Conforms to ASTM C1022 A /2(4*38mm) 170PCS B (4*50mm) 130PCS C /2 (4*63mm) 90PCS D (4*75mm)75PCS E /2(4*38mm) 170PCS (4*50mm) 130PCS /2 (4*63mm) 90PCS (4*75mm)75PCS +1 BOX