#12 24 x 3 Proferred Indented Hex Washer Head Unslotted Self Drilling Screw #5 Point Fully Threaded Zinc Cr+3 Plated Carton (1200) 5 8 11 A307A Hex Bolts Zinc Plated 1 2 L9 USS Tension Flatwasher 1 2 L9 USS Tension Flatwasher Yellow Zinc Plated Domestic USA (50) a professional grade masonry drill bit that features a 1 2" x 13" head for maximum drilling power and efficiency The unslotted hex washer head is ideal for high torque applications providing a stable non slip drive and excellent load distribution Securely fasten thick assemblies with these #12 24 x 3 self drilling screws conveniently packaged in a bulk box of 1200