Suki Chipboard Screws feature a round pan head and have a countersunk Pozidriv recess They are designed specifically to use for particle boards, MDF and timber These are self-tapping screws, thus do not require any holes to be bored first The are made of steel These screws have a zinc passivation coating which gives it a distinctive yellow patina, and increases the screw’s corrosion resistance properties No pilot hole required