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

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 1