These Stainless Steel Pozidriv Recess Chipboard Screw have a countersunk Pozidriv recess head and 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 Made of A2 grade stainless steel, these screws show excellent corrosion resistance and are able to handle extremely low (cryogenic) and high temperatures