Cobra Anchors 623J Concrete Screw Flat Head, 3/16" x 2-3/4"Highlights: Corrosion resistant, high and low thread for installation and maximum holding power Bonus: Combined head driver ( Robertson & Phillips) drill bit included in 25, 75 and 100 piece packs Flat Head + Super Drive Super Drive 2" x 2" Size In=3 16 x 2 3 4 Anchors Per Pack=25 WARNING: This product can expose you to chemicals including Nickel (Metallic) which is known to the State of California to cause cancer and birth defects or other