Security 2 hole Raised Machine screws are available in zinc or stainless steel The two Hole Security Screw as its name states has 2 holes in the head, requiring a special insert bit to insert and remove. This unique feature renders the 2 Hole Screw tamper proof, reducing the risk of vandals or intruders tampering or undoing the screws. Due to the design of the 2 Hole Security Screw it is suitable for low to medium torque applications and is ‘2 way’