1/4-14 x 4 Phillips Bugle Head Full Thread Self Drilling Drywall Screw Black Phosphate 8-32-.160 they feature a serrated flange

they feature a serrated flange that digs into the mating surface to prevent loosening due to vibration or torque

This 3/8" x 1-1/2" lag screw is made of Grade 2 steel and has a hot-dipped galvanized finish for corrosion resistance

This 1/4-20 x 1 1/4 Hex Cap Screw is made of Grade 8 steel and has a yellow zinc finish

while the medium tension provides a secure hold without damaging the mating surfaces

1/4-14 x 4 Phillips Bugle Head Full Thread Self Drilling Drywall Screw Black Phosphate 8-32-.160 they feature a serrated flange1 4 14 x 4 Phillips Bugle Head Full Thread Self Drilling Drywall Screw Black Phosphate are designed for fast and easy installation of drywall to wood or metal studs. The self drilling tip eliminates the need for pre drilling, saving time and effort. The Phillips bugle head provides a clean, finished appearance and helps prevent overdriving. The full thread design ensures a secure hold, while the black phosphate finish provides corrosion resistance.