#12-14 x 1 3/4" Self Drilling Screws, Hardened Stainless Steel 410, Flat Head, Square Drive, #3 Point, Type BSD, Full Thread (Quantity: 300 pcs)$$Hardware

Self Drilling Screws feature a Robertson Drive, also known as a Square, or Scrulox drive which has a square shaed socket in the screw head for high torque and minimal slippage 1 1 1You may also like 1/4" x 2-1/2" Combo Sidewalk Bolt, Truss Head, Hurricane Hardware, Rust Resistant Stainless Steel, 100 Pack - by, LLC$$Hardware.